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Option 1: Frog - Frogs are indeed examples of amphibians. They have moist skin and go through a life cycle that includes a tadpole stage in water.
Option 2: Seahorse - Seahorses are not amphibians. They belong to a group of fish called Syngnathidae. They live exclusively in water and do not have the characteristics of amphibians.
Option 3: Alligator - Alligators are not amphibians. They are reptiles and belong to the order Crocodylia. They have scales, lay eggs, and live both in water and on land.
Option 4: Toad - Toads are examples of amphibians. They have dry, warty skin, and their life cycle also includes a tadpole stage in water.
Therefore, option 2 (Seahorse) is not an example of an amphibian. Alert - the correct answer should be option-2 Seahorse.