https://upload.wikimedia.org/wikipedia/commons/thumb/7/76/Odorrana_hosii.JPG/1200px-Odorrana_hosii.JPG
The Poisonous Rock Frog secretes a deleterious poison from their skin that can easily kill another frog. Presumably, the frog isn’t poisonous enough to harm a human but it would be best just to stay away. One way to identify them is to look at their long slender legs that enable them to jump very quickly. Citation and more information at https://en.wikipedia.org/wiki/Hose%27s_frog