Akan=Ashanti: Check out anything by R. S. Rattray, especially his Akan-Ashanti Folk-Tales. When we get our Ashanti pantheon out, you can look at things more closely there.
Dine Bahane=Navajo: Actually lots of materials there. You can start here: http://www.sacred-texts.com/nam/nav/index.htm , but the best translation of their myth cycle, I think, is the one by Paul Zolbrod.
Dravidian: Not a culture, but a huge language group in Southern India. Try stuff like Handbook of Hindu Gods, Goddesses and Saints Popular in Contemporary South India by Harry Daniel Smith and Tamil Temple Myth...