No.. Children plus cryptocurrency is a very bad idea. They'll stop valuing both the little and big things, like "get addicted to always having that cash, being pulled to crypto as a quick payday" "be rude to parents and the community" "be stressed and who knows even suicidal when they start losing their money" among other risks. So hell no!
Yeah i don't understand why we have to involve kids into something that even adults would find challenging to understand. Yeah it's good to prepare them for the future that early but there are things that are meant for kids to learn at that age. And certainly confusing them with the mechanics of crypto won't help.