Feeding, are ducks like dogs?

[DellaMyDarling]

I've been bringing fresh feed and water to the ducks 3x a day. They act like they're starved.
They naturally killed off their pen grass but today I'm going to work on a movable pen for the yard so they can get out of the kennel every day.
So at the moment they have a tub big enough for 2 to fit in at a time and dive a bit, I dump and fill every 2 days or so. I have a pot placed in there for more water that's dumped and refilled every time I go out there (3+ times a day.) I had first put in a water fount but they didn't seem to know to get their bills into it to drink.
About 3x a day I find their feed bowl empty. Filling it makes them all excited and they scarf it down like they're starving. Are they actually hungry or are ducks more like dogs, that'll always be happy for food? These guys are eating way more than all my 10 chickens combined.

Also, I posted how the first few days they wouldn't eat at all. Clearly that progressed. I used the suggestion of "duck pellet soup". Last two days watching them eat the mushy soup I am pretty sure they were accidentally inhaling some. They take some gobbles then make almost a sneeze sound, or light cough. No sneezes, coughs, or other such things any other times, nothing indicating they are ill. Should I be concerned? Transition back to dry pellets?

 

[crazy4ChickensNducks]

I have 4 adult laying ducks, 2 kc’s 2 pekins. They have a huge pen with No grass I feed them 3 quarts a day, sometimes I let them out into a poultry net to graze, they don’t always eat the full 3 quarts, but most of the time they do. They have a kitty pool that I try to change every 2 days.

 

[PaulX]

My ducks are 3 months old and 5 months old and I still feed them every 2 hours during the day.
When they were young they needed to be fed every 75 minutes.
Of course you can feed them for fewer times, as long as you feed them a quantity such that there food bowl doesn't get emptied.

They aren't like dogs. They eat till they're full and they stop, but their digestive system is much shorter than ours, meaning they have to eat multiple meals a day. Also they grow so fast and can eat 1/3 their body volume a day at around 3/4 weeks old.