The origins get dirty unless there is some initial documentation or historical path to follow. Often it can be the name but in many cases the names have actually been altered to the vernacular.
These are a sweet version of Khao Tom Mad, with taro root and little banana. In some cases they likewise have black beans in them. Savory ones have minced pork and the rice isn’t sweet. The rice is tender, sweet with a tip of coconut and the banana leaves produce this remarkable scent. The taro and banana compliment the sweet tropical tastes of the coconut rice.