Not sure if I'm mixing elements of several movies or not, but I recall a movie from VHS about a kid who befriends a spirit who is in a dummy (or may be some sort of troll/monster spirit) - can't...
This was a straight to VHS children's movie, I believe, live action with puppets/costumes of three monsters/goblins/demons who sneak out out of their world/dimension because there was an evil...