rougarou
A werewolf or werewolf-like creature said to inhabit the swamps in Louisiana (and sometimes French-Canadian) folklore.
Like the European werewolf and loup-garou, the French Canadian rougarou also often appears in the form of a dog. Whoever neglects his Easter duties or goes unconfessed for seven years finds himself changed into a rougarou at night.
Where it comes from
From Louisiana French rougarou (“werewolf”).
Adapted from the Wiktionary entry rougarou (CC BY-SA 4.0).