Yes you can for a while. If your numbers grow think about separating them in the near future. But they will be fine for the moment.
There is one thing I suggest you do...that is to make sure your chickens have their own water as the ducks do make a mess of it.
Chickens need clean drinking water.
Ducks need water not only to drink but to also put their face in and clear their sinuses.
Ducks also need constant water to wash their food down.
They don't have a crop like chickens do so the need for them to have water with their food is important.
There is one thing I suggest you do...that is to make sure your chickens have their own water as the ducks do make a mess of it.
Chickens need clean drinking water.
Ducks need water not only to drink but to also put their face in and clear their sinuses.
Ducks also need constant water to wash their food down.
They don't have a crop like chickens do so the need for them to have water with their food is important.