Are Unripe peaches poisonous?

Online Answer
The fruit isn't, but the leaves, roots, and stem (and, in limited doses, even some unripe fruit) are rich in tomatine, an alkaloid that's mildly toxic to humans. It won't kill you, unless you chow down pounds and pounds of it, but it is likely to cause you some gastrointestinal distress.
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The green mango is basically unripe mango. Green mango can be sour or nutty and sweet depending on the variety. ... An unripe mango is very hard when you touch it and does not give in like a ripe fruit. Depending on the variety, the unripened ones in Thailand are usually green, without yellow or red..
It's not that the squash are not ripe enough to eat—although some are pretty green—they are just not ripe enough to store over a long period. ... You can continue to ripen unripe squash by bringing them inside, washing them off and putting them in a sunny spot.