Top 10: Outer Space

10) General Skun-ka'pe
From Sam & Max: The Devil's Playhouse video game



9) Rukbat, alien bodyguard
From Killer B miniatures



8) Karmans
From AT-43 table-top miniature war-game



7) Xemnu
Supervillain from Marvel comics



6) Tojjevvuk
Albino Wookiee from Star Wars



5) "Space Yeti"
Enemy from video game Star Craft II: Heart of the Swarm



4) Futurama cartoon, two instances

a) On Neptune from "Bender's Big Score":



b) On Triton from "Tip of the Zoidberg":



So apparently there are yetis on Neptune and a yeticorn variant on its moon.

3) Mugato
From Star Trek



2) The White Apes of Barsoom
From Edgar Rice Burroughs' John Carter of Mars



1) Wampa
From Star Wars