Hum, can you post pic's of frog showing feet? So it's missing all but one toe in each of it's four feet? That's kind of strange and does not appear accident or predator related. Only thing can think of; is that either it's genetic in origin or some sick person did it. If genetic it's there to stay and could be passed along if used for breeding. Even if not; would be surprised if frog re-grows missing toes . Glad you are caring for him well and he is not handicapped by it .