polliwog

noun
🔊/ˈpɒliwɒɡ/
🔊/ˈpɑːliwɑːɡ/
(also pollywog)
(both North American English)
(also tadpole British and North American English)
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  1. a small creature with a large head and a small tail, that lives in water and is the young form of a frog or toad蝌蚪Topics Animalsc2
    Word Originlate Middle English (earlier as pollywiggle): from poll in the sense ‘head’ + the verb wiggle.