In the Hobbit we learn that Beorn is a skin-changer.
The movie adaption implies Beorn is a member of a race of skin-changers. The book is considerably more vague on Beorn origins. Most online discussions assume there were other skin-changers.
But did Tolkien ever name any other skin-changers?
If he didn't name any individual skin-changers, did he ever describe any groups of skin changers?