[Graymatter]

Seriously, I'm with you. It looks like a claw, with the "teeth" mostly sanded off. The way it spreads out toward the base, tapers at the tip, is not very toothlike, but the base spread is what it should be near a joint and the tip is hooked like a crab claw. And the color at the tip, that's a claw thing, not a tooth thing.
As hoaxes go, there are better.

[TheBattman]

If the $5K reward is legit, then it would just about be worth finding a crab claw and adjusting it for the reward.

[Tallguy]

It looks like a claw, with the "teeth" mostly sanded off. The way it spreads out toward the base, tapers at the tip, is not very toothlike, but the base spread is what it should be near a joint and the tip is hooked like a crab claw. And the color at the tip, that's a claw thing, not a tooth thing.

Uhhh, the base of that -- whatever it is -- does not look like any crab claw that I've ever seen. It just doesn't look like it would fit together with the other half of the claw. I'm inclined to go with the pronghorn antler theory.