The chordate which has teeth on tongue belongs to

Protochordates

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Pisces

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Frog

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Lamprey

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Solution

The correct option is D Lamprey
The sea lamprey lacks bony teeth and jaws. It has an oral armament of conical teeth made of keratin. The lamprey even has teeth on its tongue. The oral apparatus of the adult lamprey is a sucking disk lined with whorls of over 100 of these teeth. The adult attaches to a bony fish in the ocean with the oral disk and rasps through the skin with the teeth on its tongue.
So, the correct answer is option D.

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