A puppy, or pup, is a baby dog or wolf. Dogs are generally called puppies until they are a year old. When a mother dog has puppies, there are usually about six of them born at once.
Tadpoles are the larval stage of frogs, and spend their lives in water. They hatch from eggs, and gradually change into frogs. Tadpoles cannot breathe outside of water, they have gills like fish.
