Question about green apples

[Ra]

Sam Blues and Lime Greens can still have problems. From my understanding a lot of the Sam Blues have issues from way too much line breeding. I happen to have one now that has Scoliosis. Plus these are definitely not natural Cranwellies in my opinion. Nowhere on any of the true blood Ceratophrys is there Blue coloring or even seafoam greene at least not in any of the 8 known species. Clearly something else at work here.

I had assumed it was some kind of slight melanism, lacking all that yellow pigment making them look blue.