http://www.frogforum.net/aquatic-cla...nnot-dive.html a similar question was asked a while back, not a definite answer but somewhere to start. Help With Frog Please! in African Dwarf Frogs Forum <- I also read a bit on this site with someone who was having similar issues and various aspects of the tank, feeding, ect were explored a bit. The wound def look as though the snail got at him so maybe while the poor little one was weak and not moving very much or after he died. I have had experience with fungus and it was very obvious. Injury from something else in the tank could have caused the white spot and maybe she did some damage? Just a thought, I am no expert but hopefully these links give you some idea of what could have happened, so sorry for your loss