Yes...chickens “purr”.Another question...
Last night Prince was making a different noise I never heard before. It wasier a cooing. I would compare it to lets say a cat purring. He seemed really happy.
Is this him talking to the girls? He started it before I bribed them with treats to go into the coop, but it got louder and continous on e I tossed the food in.

And it’s adorable!
Obviously it’s not quite the same as a cat but it sounds like a purr or even a cricket singing which is how my little Cricket got her name.
She used to sing so much!
My birds will do this occasionally, usually when they are relaxed and happily sitting in a spot they like.
Sometimes just one sings and sometimes many of they are doing it back and forth.
They even seem to sing in response to me talking to them too.