Hey Young Gun.
Millet is a good waterfowl food. Smartweed is another good food. Most plants need 2-3 months to mature so keep that in mind.
Theo is right about lowering the water level. If you can't lower the water level just spread the seed out on the mudflats when the water drops during the summer.
You can hunt over the stuff you plant the same year but you can't manipulate the plants such as knocking the seed heads to the ground.