Whoa - you BETTER doubt that it looks human, coz this is pretty clearly a turtle jaw. (And I'm NOT a dentist...)
Yeah, I had to cut my note short (had to go treat a patient, imagine that), but was going to point out that the jaw was pointed unlike any human with the exception of cartoon witches. Way too thick. No teeth or tooth sockets, no mental foramen, condyles too low relative to the occlusal plane. mandibular canals long oval shaped instead of rounded.
My best guess would have been sea turtle, too.
What about the other bones? The vertebra resembles human, but I expect a lot do.
The rounded surface on the other bone resembles the head of a long bone such as a femur or humerus, but the rest of that bone doesn't look human to me.