Guardian: As moths are to butterflies, so toads are to frogs – close biological cousins who fair very differently in the popularity stakes. The taxonomy tables reveal great physical overlap in what passes for a frog and for a toad; culturally, however, a chasm divides the two. Toads are not blessed with princess kisses, nor are children encouraged to pay loving attention to toad spawn. Instead, their name is used in vain as a particularly contemptuous insult. Kermit has picked up prizes including an …