Yep, they will feather out into their teenage feathers then more or less as soon as they look at pretty they molt it all out again into their adult feathers.
Oh good lord yes. stick their stinky butts outside during the day. Then when you bring them in at the end of the day they will sleeeeepppp. Give them a tub of water to play ina nd their food & water and they will be happy duckies