Does anyone know the name of this short movie? A muppet like king and prince live underground, in a cemetery under a fallen tombstone. There is also the kings evil brother and his son who are muppets as well. They all look like trolls. There are some songs in the movie and the premise of the story is that the four of them are fighting over an artifact up at the surface, at a museum, and if they don't do anything with this artifact by midnight of Halloween, they will turn into stone. It ends up that the last one holding this artifact(which happens to be the evil brother and his son) turn to stone, at the last stroke of twelve. I know that it's not the Fraggles! Please HELP! It also feature the Marx brothers as muppets and they're called the two wise guys. I believe it was a HBO special or some other premium channel movie.

SMOMONEY - Did you ever find out the name of this movie? I can tell you're talking about the same movie I remember and have also been looking for.

They did, here's the link: https://www.askmehelpdesk.com/movies/childrens-80s-early-90s-halloween-muppet-like-movie-238902.html