Interesting. I've wondered if it's just a colour variation myself. In person or with better lit pics they look more like what I see posted online as "hypos".
Here's the dad as a baby for example, which also is a better representation of what a few of the babies look like (or did before they went to new homes last weekend):


Here's one of Jeff's hypos for comparison/example


It doesn't really matter to me, I wanted the nicest examples of wild type when I got the original male but it's interesting to try and figure it out. It seems to only manifest in a few of the green babies and a few of the albinos also take on that "hybino" look. I do have one of each look in the albinos left so I'll maybe start a new thread for some comparison shots later. At the very least it could be helpful for people to see what we're looking at for different colour phases and possible hypo types in checkereds.

The ones you've posted are absolutely amazingly light looking