In my flock, I have an EE hen who "barks". It isn't a cluck or bagaaawk it sounds like a single bark. I think it means, "Hey pass those treats back this way!" since she is usually in the back of the pack and behind me when I am passing out the goodies. She is the only one who does it, and I first thought she was sick, but she is perfectly healthy and laying one pink egg a day. Anyway, it works, because I always turn around and pass the goodies. She doesn't like being touched or petted, but knows who holds the yummies.
When they go to roost, they sing what I call the "happy chicken night night song." It is one of my favorite times of day.