Kissing a toad and turning it into Prince Charming is a myth! You should never touch this protected species, which is vulnerable to the many diseases that humans can transmit to it.
Instead, look into its eyes to see its horizontal pupil and orange iris. You can also see its parotoid glands at the back of its head. These are used to excrete a venom called "bufotoxin" to ward off any predators.
The toad is a completely different species from the frog, living for the most part in the forest, out of the water, and only coming back to the water during the breeding season!