Bruno's Casque-headed Tree Frog (Aparasphenodon brunoi)

Killer frogs!
The venom of these animals is estimated to be 25 times as toxic as that of local fer-de-lance pit vipers. They deliver it by bumping their head into you and it will be injected by the spines on the skull. They are located on the upper lips, which makes this a deadly(-good) kisser!

I photographed these at a herpetology facility that is breeding them with success!

@Jorbe That is one dangerous-sounding frog! I had no idea that they were venomous.