Bullfrogs and cannibalism?

I have twp pet bullfrogs...I know they are cannibalistic but both of them are around the same size..one is just a few centimeters maybe bigger than the other...but not small enough for the other frog to swallow at least it doesnt look like it...one of my frogs are missing out of the tank, and yes my tank does have two big open holes in it, but i didnt expect for them to be able to leap that high out because they never ever did before?...Is it possible that the other frog ate the other?..or do you think the other one just hopped out and is hiding somewhere in my house?..If so where do u think it could possibly be?...And I do feed both of them large crickets everyday so they were not starving to want to eat each other?