Yes, it is okay to eat green or unripe mangoes in small amounts and scientific studies have even shown certain benefits can be found in unripe mangoes, such as helping improve digestion and constipation, helping with gastrointestinal problems and overcoming minor dehydration. You can also use green mangoes to cook with, such as adding to a stir-fry or making pickled mango, salsa or a green mango chutney (this last one is especially well known in India). If you want to ripen them though, check out the wikiHow: .