The Yeti is a character that attacks by using its frost breath to freeze enemies, doing a small amount of damage. This character appears to be absent from the BlackBerry PlayBook version of the game.
Flying enemies die instantly when attacked by Yeti's frost breath (frozen in mid-air before falling onto the ground, shattering).
After upgrading once, the Yeti can also hold down the attack button to construct ice walls which can be used to block enemies. The ice walls will shatter after taking some hits.