Jack Frost, a popular frozen persona during wintertime.
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Jack Frost is believed to have come from Germanic folklore, and was very popular with the Anglo-Saxon and Norse during winter. The crystal patterns of frost found early in the morning on the windows were said to be from Jack Frost. He is described as being the persona of cold winter and is elfish. He is also a variant of Father Winter. In a Finnish epic he comes from his father, Blast.

The boxenwolf was a human who could take the form of a regular wolf.
©BloodyLexicon.com

The boxenwolf (also known as the buxenwolf) is from Germanic lore, from the Schaumberg region. He was believed to have made a pact with the Devil himself, and can transform into a wolf with the help of a magic girdle. The girdle was said to be a gift from Hell. When it takes the form of a wolf it enjoys tormenting people. Even though he looks like a regular wolf he is still able to think like a human, but gains “wolf powers” as well. His senses are enhanced, such as smell, sight, and he is able to run incredibly fast. The Boxenwolf can have its identity revealed by someone holding a piece of steel or iron over the creature’s head. In the older tales they use iron, in the more modern versions, steel is used. Unlike the classic werewolf it can be killed with any weapon.