For many cultures frogs are associated with fertility and rebirth because of their unique life-cycle as two beings. 

"In ancient Egypt, the frog appears as a symbol of fertility, water, and renewal. The water goddess Heket often appeared as a woman with the head of a frog."(Exploratorioum)

Heket, an Egyptian goddess of water and fertility. 

Tlaltecuhtli

"Many ancient American peoples conceived the earth to be a giant crocodile, turtle, or toadlike monster floating on the sea. The rough, scaly skins of these creatures displaying geometric designs was likened to the furrowed, uneven surface of the earth and the regular patterns of tilled fields. "

https://www.metmuseum.org/art/collection/search/307636


Sources

Vosoughi, R. (2020, October 10). Frog myths, folklore, proverbs, and fairytales. SAVE THE FROGS! Retrieved April 4, 2023, from https://savethefrogs.com/frog-myths-folklore-proverbs-fairytales/

Frogs: Frog facts, myths & more. Exploratorium. (n.d.). Retrieved April 4, 2023, from https://www.exploratorium.edu/frogs/index.html

Image from Wikipedia