A Collective noun is a noun (a word or term) that is singular in form but is used to define (refer) a group of people, animals, objects or concepts. Thus, it is a noun representing a group as a unit. So what is the difference between a reptile and an amphibian? Reptiles are any air-breathing cold-blooded (uses the heat of the sun to keep its blood warm) egg-laying vertebrate with an outer covering of scales or plates and a bony skeleton which, crawls or moves on its belly. On the other hand, an amphibians are cold-blooded vertebrate that spend some time on land but must breed and develop into an adult in water. In other words , they are a cold-blooded animal with an aquatic larval stage and a terrestrial adult stage where the aquatic larvae undergo metamorphosis into adult form. Thus, they are an intermediate form between fishes and reptiles (e.g. frogs & toads). Below you will find a short list for the collective nouns for reptiles and amphibians.

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Axolotls: A harem of axolotls

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Cobras: A quiver of cobras
Crocodiles: A bask of crocodiles (congregation, float, nest)

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Dinosaurs: A herd of dinosaurs (pack)
Dragons: A flight of dragons (weyr, wing)

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Frogs: An army of frogs (colony, knot)

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Iguanas: A mess of iguanas

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Monitors: A bank of monitors

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Rattlesnakes: A rhumba of rattlesnakes

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Snakes: A den of snakes (bed, knot, nest, pit, slither)

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Toads: A knot of toads (knob, nest)

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Turtles: A bale of turtles (dule, nest, turn)

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Vipers: A nest of vipers (generation)

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