Tizheruk

The Tizheruk is an ocean-dwelling monster from Inuit mythology. They are similar to Pal-Rai-Yuk and sometimes seen as a variation of it from King Island. They have 7-foot-long heads on 15-foot-long serpentine bodies with flippers on both ends. They are known to grab people from docks and piers. 

Citations:

Eberhart, George M.. Mysterious Creatures: A Guide to Cryptozoology. United Kingdom, ABC-CLIO, 2002.

Gerhard, Ken. A Menagerie of Mysterious Beasts: Encounters with Cryptid Creatures. United States, Llewellyn Worldwide, Limited, 2016.

McElroy, D.R.. Superstitions: A Handbook of Folklore, Myths, and Legends from Around the World. United States, Wellfleet Press, 2020.