Raw bananas are also called Kach Kola, Matoki or Matokee. Unripe bananas are firmer than ripe bananas and have none of the sweetness. Therefore these are used to cook savoury curries mostly.
You can tell these apart by their green, rather than yellow, peel. They have benefits that ripe bananas do not have. They not only reduce blood pressure levels but they are jam packed with starch and pectin.
This is why they are great for digestion. You can also use these to make healthy banana fritters or fries.