That is an Amelanistic Motley. I get these light headed creatures from my Butter Motley project in all of the phases. Caramels and normals have a gray head, Butters have a pale yellow, almost white head. And as you can see, Amels have a pinkish white head. It's not as noticeable in the adults, however. But probably with selective breeding the difference can be made more pronounced. I've sold off a bunch of these over the years, so they are out there. Most people have never even noticed it or I just got a ho-hum attitude when I pointed it out, so I stopped thinking about it.