See how often they participate in the script: HERE.
Character Story: One of two yetis that Link meets. Yeto has been causing a ruckus in Zora's Domain by appearing to catch some distinctive red fish. He explains that he needs the fish because his wife, Yeta, loves them and they will help her to feel better.
Race Story: The Yeti live in a very private, frozen region in Northwestern Hyrule that is distantly connected to Zora's Domain.