Tadpole

A tadpole (also known as a pollywog) is a larval frog, toad, salamander, or newt. In this stage it breathes by means of external or internal gills, is at first lacking legs, and has a finlike tail. As a tadpole matures, it metamorphoses by gradually growing limbs and then (in the case of frogs and toads) absorbing its tail. Most tadpoles are herbivorous, subsisting on algae. In a few species, some tadpoles turn cannibalistic under harsh conditions and feed on other tadpoles living in the pond.

• "Tadpole" is a 2002 film directed by Gary Winick about a boy who falls in love with an older woman.
• In physics, a tadpole is a Feynman diagram with one external leg, and it encodes a one-point function (correlation function of one field). The name is due to Sidney Coleman.
• In the US Navy, a pollywog is a sailor who has not yet crossed the equator while on a ship.
• Some scuba diving clubs have an entry class called Tadpoles for younger children who want to start scuba diving.

See also: Tadpole, Alga, Cannibal, Club, Correlation function, Feynman diagram, Frog, Gill, Herbivore, Leg