Is he the Tommy Westphall here?

Do we know it’s Rickon? We know it’s Shaggy’s head, but couldn’t he have just been hit by a car or something, and when they were about to toss the wolf’s body in a dump, somebody said “hey, I know how we can prank Ramsay Bolton?” So the guy in the hood was just some dumb patsy, and Osha was in on the con?