It’s hard to tell because of the background Interference from the wind but given the age and the way it sounds it could very likely be normal voice changes. The white duck is a drake and his voice is transitioning from a squeaky quack onto a low quiet rasp which is completely normal, and the...
I’m so sorry your ducks are sick!
Wheezing sounds like a respiratory illness.
The bright green droppings could be a number of things, maybe a sign of liver injury, possibly poisoning. It also can be caused by an infection of the intestine or from lack of eating for a few days.
Intestinal...