This glass frog used to look like this.
Now it looks like this
Very cool transparent yellow tone with brown spots now. I am no expert on these guys but I think this one is a female.
I have another glass frog which kept his transparent green color but did get the brown spots like this one. He appears to call to her at night and look for her. They are hearty and great froggies. They are always out basking/sleeping during day, not so shy like other reeds.