Cipactli

 

In Aztec mythology, Cipactli was a vicious primeval sea monster, part crocodile, part fish and part toad who was also bisexual. Always hungry, every joint on her body was adorned with an extra mouth. Tezcatlipoca sacrificed a foot to her when he used it as bait to draw her closer. Cipactli was the source of Tlalticpac (the Earth) which the gods created from her body.

Compare Tiamat in Mesopotamian mythology, Fenrir and Ymir in Norse mythology, and even Sedna in Inuit mythology.