Nah, my guess would be in our tank temps we would never see a problem, by the time the fish ingests the food its usually thawed.
+1
It would be like us trying to eat a pound of frozen ground beef. We wouldn't be able to bite off a chunk unless its thawed. Given u aren't some freak with jaws of steel!
-Brandon
Discus.....The best cult I've been a part of! B's Bunker