The picture you see is not of some kind of a gadget or a light shaped like a frog…this IS a real frog who was kind enough to eat a light and be photographed!
Then I read this about glowing puppies
A cloned beagle named Ruppy – short for Ruby Puppy – is the world's first transgenic dog. She and four other beagles all produce a fluorescent protein that glows red under ultraviolet light.
A team led by Byeong-Chun Lee of Seoul National University in South Korea created the dogs by cloning fibroblast cells that express a red fluorescent gene produced by sea anemones.
I am sure this research will have some potential use in humans... but I hope these don't catch on as pets!!