As humans, we tend to anthropomorphise animals. An animal's level of 'cuteness' will often be directly linked to a standard we created for ourselves and are able to project onto other creatures.  Frogs have never had an easy time in human history. Due to folklore and an old fantasy book - much like the snake - frogs are seen as evil creatures. However, some frogs find it harder to captivate humans than others. The Surinam Toad is one of them.