So, I drew the frogs tiny. They should take up far more space but I hope this is enough to get the idea. This is a double cross over so I included a diagram of the motion.
Part 1: The egg hatches into a tadpole
Part 2: The tadpole develops legs
Part 3: The tadpole develops into a full grown frog
Part 4: The frog lays an egg
Part 5: The frog leaps away (into a hole, off the frame, frog dies and decomposes, something…)