How Does the Translucency of the Glass Frog Change the Color of the Frog?

The translucent skin of the glass frog doesn't actually change the color of the frog very much. What changes is the amount of light that is allowed to pass through the frog, and specifically parts of the frogs such as the outlines of the toes and the legs. And they did find ecologically that this level of transparency did increase survival. So the frogs that let more light through their skin got preyed on by birds less. They say it was the legs which surround the body at rest and create a diffuse transition from background to frog luminance.