Board Thread:False Info and Speculative Discussion/@comment-4091815-20140604202725/@comment-5690373-20140606223144

Skin-walker: Someone who wears the skin of an animal and can transform into said creature.

Berzerker: Powerful nordic warriors who would go into a trance-like state before going into battle. They were said to battle completely naked  or wearing an animal skin (some more gruesome versions have them wearing the skin of their enemies).

In the teen wolf universe though there doesn't seem to be any difference between the described berzerkers and the real life myth of the skin walkers. Maybe berzerkers are more brutal? Or maybe skin-walkers don't even exist.