Morphological difference between diploid and triploid rainbow trout

[wall3y3]

So I searched high and low on the internet for any info on this.  Pretty much everything I found says that diploids and triploids have no morphological difference.  Maybe I am up in the night but I feel like I could identify the difference visually by looking at the head and snout.  Triploids seem to have a small head and stubby snout that just looks a bit off.  What do you think?