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.