Ducklings not eating starter feed
Our chickens eat when hungry and the more you free range the less feed they'll eat since they can fill up a good amount of daily food on greens and bugs ect :)
If they're hungry for other things and not eating the starter food it might be that they don't like it.
For example my first batch of hens won't touch pellets. I tried every brand of pellets available at my local TSC and they would not touch them. I tried feeding them at different stages of duck maturity ... babies, teens, adults, layers.. nope.
Peas are like duck crack :).
If you think they're choosing to eat the peas over their starter food, you could try mixing in the peas with the starter food and see what the dish looks like after a couple of hours. Hopefully they'll just eat mouthfuls of it now that the peas are mixed in. Gradually reduce the peas until they're eating your starter feed & then you can offer the peas as a special bonding treat.
If they eat all the peas and leave behind the starter feed you still won't know if they just really like peas or really hate their starter feed. I'd probably try some other feed at this point. Wild birds or friends with poultry would probably gladly accept the starter feed.
Turns out my first batch of hens like game bird style feed or whole grain type feeds. So thats the kind of food i give them now.