tadpole
Concise Oxford English Dictionary © 2008 Oxford University Press:
tadpole/ˈtadpəʊl/
▶noun the tailed aquatic larva of an amphibian such as a frog, breathing through gills and lacking legs until the later stages of its development.
– origin C15: from OE tāda ‘toad’ + poll (prob. because the tadpole seems to consist of a large head and a tail in its early developmental stage).
'tadpole' also found in these Oxford entries:
