Hi there, call ducks are fascinating waterfowl and great fun. I ve kept them for about 3 years now so no expert but learnt a bit about them. They're very sociable and bond well.
The females do have quite a loud laugh like quack but the males just a gentle rasp. I have 4 males that bonded from ducklings, 3 from the same hatch that always stick together. Only breaking ranks at mating season. So having a few males should be fine. Most breeders would be glad of you to take a few male ducklings. You can find them on preloved waterfowl or auctions.
They're easy kept as long as have some grazing space ideally, small bath or pond, netted enclosure preferably and coop for the nights.
Charming, intelligent, friendly creatures that make good pets too.