Playable Serpentfolk?

[J. A.]

Is there a playable version of the serpentfolk, something scaled down (so to speak) to the level of the standard races?

I expect the quick-and-dirty answer is “play a nagaji,” but I’m wondering if there’s a more elegant option, maybe tied directly to serpentfolk lore in Golarion.

[Nyerkh]

Nope. They're kind of a thing of the past in Golarion : supposedly extinct, actually mostly dormant. Also powerful beyond most races.

Nagaji and Vishkanya have precious little to do with them, so I would not go for that. At least Vishkanya checks some of the boxes, but even they don't quite fit.
That's the kind of thing the race building rules are for, really.
Look at the PC Drow vs monster Noble Drow, try to tone serpentfolk down to a similarly acceptable degree.

[BENSLAYER]

Would Reptoids be close enough?

I am not a fan of the real world associations but this is the nearest that I could find.

[J. A.]

Okay, thanks. I don't know much about Golarion lore and wasn't sure how the various snakey races fit together (or not).

And I appreciate the mention of the Reptoids, I keep forgetting about them. One of the sillier races, but worth looking at in this context.