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disgorger

n. (context angling English) A device used to remove a hook from the mouth of a fish

Wikipedia
Disgorger

A disgorger is used in coarse fishing to remove a fish hook from deep inside the mouth of a fish that is not possible to reach using fingers alone. It is also known as the Unhooker or Hook remover. It is typically made of plastic or metal and is used on smaller fish. Larger fish that are hooked deep inside the mouth can be unhooked using a pair of forceps or a pair of long-nose pliers.