Do any Thai banks offer such a thing for children, where the parents ar in control of the account until they reach 16, for example. Has anyone had experience opening such an account if they exist and make a recommendation?

I tried to do exactly that for my gf's two daughters (aged 12 and 14). My gf's bank (Bangkok Bank) told us the only bank that offers that service (Youth Accounts) is Omsin, aka Government Savings Bank (the pink one). The girls had no difficulty opening accounts there. They each have their own passbook but no ATM card until they turn 15 or 16 (can't remember which).

Thanks