Nanook of the setting sun

hi all, any help appreciated. I am trying to find a book I read as a child in the 90’s so that I can read it to my daughter. All I can remember is it was about a polar bear adrift on an ice burg and their name was nanook of the setting sun, they thought they were alone but met another blue polar bear. sorry I know it’s vague but I’ve tried all I can think off to find it. TIA