Excellent! And even better, one of my players has Hallowfaust! The Fire-Spitters look perfectly nasty to add to my ratling hordes.
I also found, while perusing the SL collection of that player (who i summoned this evening), I found a couple more bits:
Severin (fighter/rogue NPC) in Wise and the Wicked. Interesting guy, I might adapt him to my Greyhawk game.
Hassek Ruukbrood (ranger NPC) the bounty hunter, also in Wise and the Wicked. This guy's nasty, i'll definitely use him.
P'kouro'nk (rogue NPC), again with the WatW. This one's a bit odd, but interesting, involved in some weird prophecy or such iirc.
A few other related items I found in delving into our combined collections of 3e/d20 material:
Jacqueline Renier, Wererat Darklord of Richemulot (In Ravenloft). I've already adapted her to my campaign, she's great. Evil to the core, but loyal to her rodent kin. Fun. (see Secrets of the Dread Realms for her stats and complete bio)
Green Ronin's Shaman's Handbook has some great material on Sneer, the Spirit Lord of Rats, as well as details on the shamans who serve him. If, like me, you're using the ratmen and their kin outside of Scarred Lands, he makes an excellent patron for them to serve and form a religion around.
Thanks for the input everyone!