They will find their food. A trick that I use is to put a small candy bowl in the back corner of the tank hidden by some plants. I feed from the other end of the tank. As the crickets move around they get eaten. If they don't get eaten they find their way into the bowl and can't climb back out. The frogs know where to find them if they want one. The next time I feed I dump the bowl of crickets back into the cricket tub to re-gutload. Helps keep the enclosure clean and no crickets running all over my frogs while they are sleeping.