Pirates of the Caribbean - Dead Man's Chest original screen used set dressing piece.
This is a prop skull that was custom made for filming. These were used as set dressing and can be seen at various locations in the cannibal's village. The skull is made of hard foam and presented on a custom wood base for display.
Cannibal Island Scene:
https://www.youtube.com/watch?v=F6o_MM02vAA