Frogs and Food for Thought * A frog's tongue is attached to the front of its mouth.It's covered with a sticky sub-stance that helps it catch insects. * Frogs swallow their food whole. * A frog retracts, or closes, its eyes-often one at a time - when it swallows.This helps force food down the ftog's throat. * When a frog eats something poisonous or bad tasting,it can " throw up" its entire stomach. The stomach actually comes out of the frog's mouth and empties its contents.