Good question. Amphibians can, to a degree, change the color of their skin but it's nothing at all like a chameleon. Sun exposure, temperature, and humidity play a role in the brightness and tone of an amphibian's color. Colder cloudy/rainy days in the wild will yield darker colored amphibians. Gray Treefrogs, which have a better latin name: Hyla "versicolor" do this to an extreme. Depending on environmental conditions they can range from gray to green to brown. There is also some variation from individual to individual. American Toads, for example, can range in color from black to light tan or red. Females tend to be darker and redder but that's not always the case.

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