Not counting dragonborn from 4e and 5e, have you ever offered lizard men as a playable race in a fantasy game? Would you?

Did anyone take the option? How did it go? Did it lead to any interesting RP?

I think Alshard ff (saurus) and Sword World 2.0 (lildrake) both have lizard-men as player option. Radiance and Legend too.

And Wildblades for Instant Fuzion.

I had several campaigns where they were a playable race (I also liked using kobolds in my campaigns). It generally went well as long as they fit in the setting okay.

Yes. In 3.0 when savage species came out. We had one that was a savage (bbn, ranger, something. It was a long time ago). It worked pretty well. We roll-played towns people not being okay with a "man-eater" coming into town and trying to buy gear. We had him have to balance his pride with the convenience of pretending to be another player's 'monstrous servant.' We also tried to role play up his having a completely different mindset. Not just "why are we burying their (or our) dead? That's perfectly good meat." but also that he'd have a completely different goal structure and what he would or wouldn't consider reasonable.

We also had a bizaare one where we had a two-headed half-lizardman, half elf maiden (we decided that they were stitched together by a mad wizard). Probably house ruled. But that was our barbarian/wizard. Very unoptimized but fun.

I've played in a few settings where it was an option, but can't recall anyone ever choosing to play a lizard.

One of the characters in our current 5e group (playing Razor Coast) is a Lizardman. Home brewed from one of the other races (a type of dwarf?) with light modification. Mechanically it works fine.

In terms of impacting the game, his presence does add some interesting twists. First, he is the Ship's Cook, but we rarely eat anything he has prepared... There was a kerfuffle at character creation when one of the other players was adamant that his PC wouldn't associate with an eater of sentients. He got over it eventually, but changed his character for non-related reasons a little while later.

The Lizardman is largely treated like a savage by people in game (there is a Lizardman community in the campaign as written) and this has had effect when attending social functions, for example.

He also wants to collect the bodies of fallen enemies, which we are fine with for non-humanoids, but it generates some good inter-PC friction when he wants to eat members of more 'normal' PC races. He also doesn't see the value of money (shiny trinkets you can't eat or hit someone with - what's the point of those?) which is amusing to the rest of the characters but we don't let him fall behind on kit simply for group survivability (the Ship's Captain usually buys things for him and often we all chip in since his share of the treasure is split between everyone else).

It adds colour for minimal cost.

I've played non-standard races in the past (a wemic whose best friend was a kobold was my favourite) and they can be a lot of fun if you put a little effort into making them more than just a human in a funny suit. Personally I find more extreme races easier to role play than the vanilla fantasy races as the increased difference makes them more distinct - I find it gives me something more concrete to work with.

I'm in the process of rebooting my game after a year long hiatus. For the first time in one of my games, one of the racial choices is going to be lizardman. It fits the geographic starting point and also campaign memory (the players --everyone gets new characters-- have had dealings with lizardmen before).

But I also made goblin available (and also for the first time). Two players are jumping at the chance. So we'll see.

They were a playable race in Hollow World. They were powerful if you were running a game for 1st and 2nd level characters. Of course, in the extreme long run, they hit level limits. In what I consider the golden range of play, levels 3-8, they had some substantial advantages but nothing game-breaking.

ACKS offers the Thrassian Gladiator as a playable class, Thrassians being a race of lizardmen in ACKS' default Auran Empire setting. I've previously had them available, but they don't exist in my current campaign, and no one picked one up when they were available.

In Earthdawn, the lizardmen-like t'skrang feature prominently in Barsaive as the main traders and movers of goods along the Serpent River. There are several different houses that vie for control of the Serpent River including House Ishkarat, House Syrtis, House V'strimon, House K'tenshin, and House T'kambras. The t'skrang are a cultured people who live for sailing, swimming, barter, acrobatic swordplay, acerbic wit, trade wars, and political intrigue.  In Prelude to War and Barsaive at War, all hell breaks loose along the Serpent River when House K'tenshin allies with the Theran Empire, forcing House V'strimon and the Throal Empire into an alliance and bringing all-out war to the Serpent River.

In Shaintar, the lizardmen-like dregordians have their own country in Dregordia and are some of the few people to live in the Serpent Marshes. In Shaintar, the Dregrodias are primordial creatures trying to control an inner rage, aligning them much more closer to D&D lizardmen.

I have Thrassians in my own ACKS game. They're not really popular for some reason.

It's been a long while since I ran it, but the Yrth setting for Gurps has Lizardmen as an option and I've 2 players run them at different times.  The are unusual, but integrated into at least some areas, so while they stood out, they weren't treated as monsters.  At least that's how I ran things, though it's also my recollection.

Straight lizardmen, strong and stealthy but no powers, don't seem all that popular IME.
Wayback when I allowed just about any sort of creature in my games (I'd been reading the Arduin books); we had centaurs and Phraints and vampires and a robot but no lizardmen.
I had them on offer in a WFRP adventure set in Lustria bit no one bit.

I've been thinking about adding playable serpent men to our DCC game but that would pretty much be like letting them play Drow.

Yes, a few flavors.

A player even had me run a solo game just so he could try being a TFT Reptile Man, as they start out very strong but stigmatized. He had fun going on a rampage for a while.

In another games there were some Reptile Man wizards, who were cool. Quite strong but on the outside of society, working with trusted friends who gained valuable allies but also extra shares of trouble.

The main issues tend to be social, particularly when the reptiles are a minority who are individually dangerous - there tended to be a mutual mistrust, outside the party, anyway. Of course, they can be invented in various ways, but there's a natural tendency for humans to fear or distrust them.

It's different when in a mostly-reptilian nations. I've had some of those in TFT and GURPS, and also in a game based on the computer game nations in Dominions, where there are the C'tis, who have a few species and are a pseudo-Egyptian nation with a sophisticated culture and powerful necromantic skills, poisons, and in some cases a horrible plague that they themselves are immune to, and not as physically dominant individually. Having a reptile nation turns the species xenophobia on its head with regards to humans.

I think it's most interesting if the designer/GM come up with what the differences are both socially and in terms of how they think and feel and experience life, rather than just having them be a special effect but not thinking about how they're really different from humans.

I had a player play a lizard man in my Runequest (rules only, no Glorantha) campaign.  Did fine.

I've had lizard men at my table in D&D 3.5.

Generally I haven't had too many players get worked up over heavy duty immersion that wanted to give it a go, and the players I've had who liked thinking a lot of heavy character thought stuff generally were good table-gamers, meaning they didn't stick their character to deep into other players fun unless invited.

So, no. No troubles.