Frogpole

Tadpoles and frogs were my next fancy; the intermediate stage known in the family as "frogpole" pleased me most.

Source: wiktionary

Since it could not feed because its digestive tract was incompletely transformed, its life as a “frogpole" lasted only a few weeks.

Source: wiktionary

They determined different visual pigments in three developmental stages: in the tadpole (no matter whether legless or with hindlegs and almost fully developed forelegs), in the frogpole (the stage of almost completed metamorphosis), and finally in the adult frog (Section V,B,3,a).

Source: wiktionary

As they undergo the transformation of metamorphosis from tadpole to adult, there comes an awkward juvenile stage that for frogs has been called “froglet” or “toadlet”, and even “frogiwog” or “frogpole." First the rear legs appear, then the front limbs. The tail and gills are absorbed for food and lungs develop; now the tadpole surfaces for air.

Source: wiktionary