i can see where your coming from (with it being an encrusted tooth, the shape is quite convincing), but i think its unlikely. it looks to me to be a wierdly shaped nodule. the rounded bits on the left of your second pic are a bit of a clue to that i think. it could be a tooth. but the only way to find out would be to break it. it looks pretty tough and would be a nightmare to prep. better luck next time.