The Hobbit - Chapter 07 - Queer Lodgings

[Raynor]

He's the only one Tolkien wrote of.

Not the only one :

Originally Posted by The return journey, TH

Beorn indeed became a great chief afterwards in those regions and ruled a wide land between the mountains and the wood; and it is said that for many generations the men of his line had the power of taking bear's shape, and some were grim men and bad, but most were in heart like Beorn, if less in size and strength.