Teresa- There is no such color as "Grey Trout". Grey, in the Mallard-derived breeds, is the wild Mallard color. What you are seeing is Blue, the result of the Blue dilution gene (plus wild-type of course). None of your birds are Trout. Trout is light phase Mallard and looks completely different. The bird you have pictured is a probable Blue Fawn. The picture you posted from the front looks even more apparent as Blue Fawn. I raise several breeds in that color, including Runners. They often have a little less Blue than yours on the back, but yours is still definitely within the range of what is normal for that color. Anyway, I can't post more detail on this board, but can give you more input via PM if you need it.