Throw them on the ground and talk to the chickens at first. After a few days squat down and talk to them while the food is on the ground. Then hand feed them and talk to them.
ok so you are going to have to work a bit harder with them as these are more wild breeds. It takes treats, time and talking! Eggs, mealworms, scratch and oatmeal are treats you should try.
What breeds are they? I've found that simply going out there, talking to them, bringing and feeding them treats, holding them and cuddling them, they are super tame.