While the distinction between toads and frogs is to some extent an arbitrary one, a toad will typically move in an ambulatory fashion (i.e. by walking) whereas a frog will hop. Toads are also generally more terrestrial in their habits.
Most toads are predatory upon invertebrates and other small animals.
The main defence of toads is unpleasant-tasting or poisonous skin-secretions, though some will also inflate themselves to avoid being readily swallowed. The North American toad Bufo alvarius is actively sought by 'toad-lickers'  for its powerfully psychoactive secretions.
In parts of Australasia, the introduced cane toad, lacking any natural predators, has become a serious pest.