Question

Why are the lungs so much smaller in a frog?

Answer 1

When the frog is out of the water, mucus glands in the skin keep thefrog moist, which helps absorb dissolved oxygen from the air. A frogmay also breathe much like a human, by taking air in through their nostrils and down into their lungs

Answer 2

Because their body is small and thus not needed and they also breathe through their mucus gland