I am a puppet fabricator for LAIKA Entertainment. These are the mechanical heads that I created for the 2012 feature film, Paranorman. Each one is about 2 inches tall. They are made of plastic, epoxy fiberglass, brass, steel, photopolymer, and some glue.
This skull goes with the puppet called "Sweet Girl", pictured next in the list. she can be seen several times in the movie, at one point biting the leg of a zombie.