I did something similar a few years ago with crab apple and persimmon seed. Made a line with the tractor tiller and worked them in. One crab apple came up-lol. Maybe the deer hit them before they got big enough to see? Tried the same thing with acorns and had really good luck. I went back and caged the ones that were appropriately spaced.
It should work if you can control the grass and weeds.
Those ducks are going to be awesome. Can't wait to see what they look like.