You have had ice cream before for sure, but have you tried Dippin Dots? It's made in a special way: by flash freezing ice cream mix in liquid nitrogen. It comes in different flavours. And the way it feels on your tongue is exceptional.
My kids love to stick the little balls on their tongues before eating them. The flavours and colours make it a delight to have as a treat once in a while. I do feel it is more expensive than other types of ice-cream so we keep it for special occasions.
No I haven't but I am not sure how they would compare with the generous scoops of icecream which I tend to have a bit of a liking for! If I ever come across such a creature I shall definitely give it a go.