Poison dart and poisonous arrow frogs are not separate types of creature. Many tree frogs, mainly from the Amazon forests, concentrate poisons from the insects they eat, such as certain ants, and...
Poison Dart Frogs do not shoot their poison. They are named Dart Frogs because natives in South America used to use them to make the tips of their arrows poisonous.
i guess it breathes through its skin, like a regular frog. the only reason it doesn't die is the fact that they eat stuff that are poisonous, so i guess it's immune.