ltsite6
Chirping
In my own personal experience yes, but however, watch them for a while. If they pick on them too much it could cause problems. Normally, chickens especially, will do a few pecks here and there to new younger birds, but they quickly accept them normally. So just watch. And give them a little bit of time. They most likely are old enough to have little to no problems. I currently have 11 muscovy's, (about the same age as yours) living with some turkeys that are twice their size. At first the turkeys were very creeped out by the Ducks. But within a few hours they all run as a little flock. This is my own personal experience. I am pretty experienced with a diverse flock of species and age. And I would say you should be absolutely fine, just spend a little time watching your birds!