My son bought these 4 at TSC for me to raise for his kids. He has no idea what kind they are. I don't know much about ducks. I was guessing 4 female Mallards?

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there is no way to know if they are female yet.
do they all 4 quack? if so then they are females.
if not they either males, or too young.
they arent old enough to have the bright green heads,
as they get older they will get them,
They quack but I haven't payed attention to who's doing the quacking. I'll have to see if I can tell.