Polar bears and Moose are Arctic animals. The mouse idea is really cute too!
I also found Musk Ox, Whales, Seals, walrus, Puffin, Snow Goose, Wolverine, reindeer, weasal, ermine, Arctic Wolf, Arctic Fox, Arctic Hare, Alaskan Malamute (in the upper parts of Alaska which is sometimes referred to for Christmas/North pole stuff), Snowy Owl, Polar Bear. Now I'm gonna have a heck of a time picking two animals! I may do the mouse/hamster thing since my daughter has hamsters and the elves would have seen them at her house. hmmm.....something fun to ponder today!
I'd still love more ideas....just like the mouse, I'd never have thought of that!