I have a frogspawn that is about as wide as 2 softballs and it touches mushrooms (discoma) all the time. It does burn them, but the mushrooms never DIE!!!! Unfortunately, I would like them to die but that is a different story. If you can find a way to kill mushrooms effectively to where they never come back please let me know. Otherwise, your frogspawn will not totally kill your shrooms.
P.S. Don't let the frogspawn near Ricordeas however!