Blue-green tree frog has a genetic abnormality in which yellow pigment is not produced. Take away the yellow and you have blue.
I’ve seen green tree frogs that were nearly yellow, leaf green, dark or forest green, olive-green and chocolate-brown. Those color variations are due to the individual’s temperature, the color of the object it happens to be perched upon at the time, or mood. Most frogs are darker when the ambient temps are low. Green tree frogs can and do change their color.
Any green reptile or amphibian which is normally green in color would appear blue if lacking yellow pigment.
The lack of yellow pigment is referred to as axanthic. The individual in the photos is anaxanthic green tree frog.
a = not
Xanthos = yellow
ic = pertaining to or having characteristics of

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