Book of Tulu Nadu folktales

B. Surendra Rao; K. Chinnappa Gowda, eds. (2018). The Rainboy: Tulu Folk Tales. New Delhi: KANNADA LANGUAGE CHAIR.

EDIT: Following e9967780's suggestion, here's a link to the book: https://www.amazon.com/Rainboy-Tulu-Folk-Tales/dp/8193560949

Some stories:

* Wedding of a Tortoise = a turtle is born to a king and a queen and goes on adventures to fetch a flower and marry a princess. Has similarities to South Indian stories about a turtle prince.

* The Tale of a Fish = a queen gives birth to a fish prince; stepmother sends stepdaughter to die and be eaten by the fish to get rid of the girl, but the girl is helped by Isvara and Parvati (Mahadeo or Shiva in other variants), girl disenchants fish prince and marries him; stepmother tries to kill and replace the fish prince's wife with her own daughter

* A Tale of a King (tale 56) = king brings mango to his queens to have a child; youngest queen eats mango and has twins, whom the elder queens throw in the water to kill; twins are rescued from water and later sent on dangerous quests, including for a supernatural maiden.

* The Bamboo Girl = a prince is convinced by his sisters-in-law to bring home a wife from a bamboo; the prince meets a group of people that give him a bamboo from which a girl emerges; prince faints and a woman shoves the bamboo girl in a well (or a ghat, or a pond) and replaces her; bamboo girl suffers transformations.