This folklore creature came from the Algonquin folklore of Canada and some parts of northern US. There are a few different accounts on how they look like.
Some say they are a furry beast that is bipedal while some say they are human-like but very tall and impossibly thin as if it has been starving for a long time. Which according to folklore, is a creature that is forever hungry for human flesh.
But this creature is not only a creature that is eternally hungry, they could also be in the form of a spirit where they can possess people. Those who are possessed by them are said to have a never ending hunger just like them.
Due to the possession, the people are then turned into monsters, or should I say a cannibal to be precise.