Gah! If the otto is dead. . . that's even WORSE! I really don't know ANYTHING about Ottos. . . I suppose he'll lose his suction eventually? This really is a terrible predicament! Leaving the lights off is the only thing I can come up with, too - but if the Otto is dead, there isn't much of a chance he'll calm down and release suction. The problem isn't with the FROG. The poor little guy just prolly accidentally chomped him thinking he was food. . . mine accidentally chomp each-other all the time, and just release. I'm thinking you were right, the otto instinctively 'fought back' and now is stuck. . .
If he's dead, I imagine he *must* lose suction at some point? Just make sure the frog stays near the surface so he can breathe. . .