The Hook Island Sea Monster, also known as the tadpole creature, is the name given to a 70-foot sea monster sighted off the coast of Hook Island. It resembles a giant tadpole, has a gaping mouth with small teeth and eyes placed on top of it’s head.

The monster was sighted by Robert Le Serrec and his family in 1964 when it moved towards his ship with its mouth open as if to attack. He spotted its tail was injured, probably by a ship’s propeller or by a larger creature. (Source)