Coloring of Green Tree Frog

[Frogger05]

Hey everybody, I had a question about my GTF, Frogger. Since I first got him, I noticed that right under the white stripe going down his side it is always a mint green color. Even when he is brown, there is that one area of mint green. It's different from the lime green that he is naturally. I will try to take a picture to show you guys when I can. I was just wondering if it's some sort of rare skin deformation or just a coincidence. Thanks!

[Sanimal]

My green tree frogs are always dark brown and still have green spots sometimes here and there. At least from my experience it's not a skin deformation, although I'm not completely sure.