This would be the result of my over-excited Bullfrog during a feeding. I was in the process of feeding him roaches from a hemostat. This is actually the second time he got me. The first was just a grazing wound. This time he got my whole thumb in his mouth and latched down. He was about 2 feet out of the water when he decided to let go. I have three distinct tooth (or odontoid) marks on one side of my thumb (the bleeding side.) He is much calmer during feeding on the dry side of his tank. Won't be feeding him in the water again.