There are a few synonyms for the term baby frog, such as tadpole, polliwog or froglet. Tadpole is a common term that refers to the larvae stage of a frog, where the frog is still developing its legs and lungs. Polliwog is another term for tadpole that is used in North America. Froglet is a term used for a young frog that has already developed its limbs and lungs partially and is about to transform from a tadpole to a full-grown frog. These terms are often used interchangeably, but they all refer to the younger stages of a frog's life cycle before it becomes an adult.