I don't even remember how I found this originally, but it piqued my interest.
This reddit thread does a better job explaining the details, but essentially someone remembers watching a creepy short on Nickelodeon in South America. It's a stop motion that features bone animals attacking a butcher
I believe the guy made more threads on other sun reddits discussing it, so details might be a little scattered. As far as I can tell though there are no good leads and the topic kinda got buried.
I'm kinda interested in this and it sounds a lot like Clock Man and Plug Man (which were both found), so let's see what we can find.