Does Bigfoot(aka Abominable Snowman,Sasquatch,Yeti)appear in any of the manuals?

[Dalmosh]

In core WotC 3.5, yeti are in Frostburn

 

[Scorpio616]

What role is this critter going to serve? I'd just use some other critter's stats and just pencil in Type: Humaniod (Human) or Monstrous Humanoid.

Neutral forest dwellers? Use the Ape stats with a slightly bumped INT.
Ally to PCs? Use bugbear stats
Beatstick to tear some HP off of the PCs? Use Brown Bear with a slightly bumped INT, describing the bite as a headbutt.
Multiattacking monster with cold aura? I'm guessing the yeti's stats from frostburn.