Not that I'm a dha expert, but I agree with Ariel. The scabbard looks like it was assembled from a bunch of odds and ends. I'm wondering if that scabbard was assembled using a bit of lattice-work carving from somewhere, along with the rattan and the Naga dao-type scabbard.
My unofficial-as-a-biologist guess is that the jaw is the front of half a dog's lower mandible. It's from a reasonable sized dog, though, not a Chihuahua. Notice that the canine is nearly the diameter of the handle, and extrapolate from there. It doesn't look like whatever the jaw was stained with stayed on, either....
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