Kids book (short stories?) about different bears

All I can recall is a story about a sun bear (with a crescent shaped patch on its chest) and a story about a bear that turns blue (maybe after jumping into a lake or something?). I was thinking it was a collection of short bear stories but it could all be one… I have spent so much time googling please someone helppppp

Infinite thanks to anyone who can solve this it’s been bothering me for years 😭