NO, that's not right. If they turn green you shouldn't eat them. If they sprout in darkness, so the sprouts are white, just pluck the sprouts off and peel like normal.
Just don't eat green potatoes.
Potatoes being green is also unrelated to them sprouting it just happens when they get too much sunlight while growing
You're right I misremebered it. We usually grow our own potatatoes and there are already some green ones in there so I wrongly presumed it was only during growth
Because the green indicates that toxins have formed inside the potato from exposure to sunlight
Basically the potato wants to protect itself from insects, and so it makes itself un-edible when exposed to sunlight, aka. the surface.
