MANDOOKAM (famously used in tamil to scold, but it is actually an amphibian !!!!)
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water snake
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crocodile
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cockroach
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frog
D
Correct answer
Explanation
The Sanskrit word 'maṇḍūka' (मण्डूक) means 'frog'. Frogs are amphibians, which matches the clue in the question. While the word is sometimes used as an insult in Tamil (and other South Indian languages), biologically and etymologically it simply refers to a frog. This is a good example of how biological terms can acquire derogatory colloquial meanings, but their literal meaning remains.