The Panamanian golden frog is a critically endangered species of toad endemic to Panama.
Panamanian golden frog (Atelopus zeteki), Toronto Zoo.
Panamanian golden frogs secrete a rather potent neurotoxin in order to protect themselves from predators. It is highly inadvisable to try to handle one, handling is also bad for the frogs.
Panamanian golden frogs are critically endangered because of habitat loss and because of chytridiomycosis infections spreading through the population. To preserve the species several zoos participate a captive breeding program for Panamanian golden frogs.
Since Panamanian golden frogs are critically endangered you are definitely discouraged to try to get one as a pet, and it could very well be illegal in your jurisdiction.
Further Readings:
Golden Frog on the World Association of Zoos and Aquariums website.
Panamanian golden frog on Wikipedia.
Watch this YouTube video about Panamanian golden frog breeding program at the Smithsonian’s National Zoo.