Henry gave you excellent answers.
I have hatched my very first eggs (= faverolles) 4 weeks ago, and fell in love with them.
All 9 chicks are sweet little darlings, I do know what Henry says about "chirping and their own sound", because I also have almost same age Marans chicks, and they never made that kind of sound.
My faverolles are talking to each other in their own way, and it sounds like "singing" and I love it. However, it is not loud sound, it's quiet and relaxing sound.
When I do gardening or clean up the chicken bed, feed, etc... faverolles are hopping onto my shoulder and stay there as long as they can. They are great birds.