Qalupalik (2010)

This animated short tells the story of Qalupalik, a part-human sea monster that lives deep in the Arctic Ocean and preys on children who do not listen to their parents or elders. That is the fate of Angutii, a young boy who refuses to help out in his family’s camp and who plays by the shoreline... until one day Qalupalik seizes him and drags him away. Angutii's father, a great hunter, must then embark on a lengthy kayak journey to try and bring his son home.

Unfortunately the movie Qalupalik is not yet available on HBO Max.