How can I get the crocomouth bone?

Hint 1 of 9:

You first need to take the meat off the bone.

Hint 2 of 9:

Or find someone else who can.

Hint 3 of 9:

The monster underneath that trap seems awfully hungry.

Hint 4 of 9:

You can open his trap door by pressing the button that's next to the trap.