The green mango is basically unripe mango. Green mango can be sour or nutty and sweet depending on the variety. The sour ones are used in the place of lime or in combination with lime in Thai dishes. An unripe mango is very hard when you touch it and does not give in like a ripe fruit.
One cup of diced mango contains 100 calories, 1 gram protein, 0.5 grams fat, 25 grams of carbohydrate (23 grams of sugar and 3 grams of fiber), 100% of the daily need for vitamin C, 35% for vitamin A, 20% of folate, 10% of vitamin B-6 and 8% of vitamin K and potassium.