This is the South American polka dot tree frog, it fluoresces. Fluorescence does not mean that it can glow in the dark, it is a property that reflects an ultraviolet (or black light) wavelength. Things that glow in the dark possess a property called phosphorescence, this material gets energized from a light source and dissipates this stored energy over a period of time.
Another way animals or insects can glow is by bioluminescence. This differs from phosphorescence and fluorescence, it causes the glowing effect by a chemical reaction between an enzyme and a pigment in the creature. This reaction produces the energy that causes it to glow. Fireflies glow from bioluminescence.