It is not just tasteless, the skin glands of many frogs and toads produce toxins.
"In Los Angeles under the legislative ban is the process of licking frogs. Local gifted teenagers, prone to addiction, found that the skin of certain species of frogs emit hallucinogens. If diligently to lick a frog, you can obtain your portion of a particular consciousness. What teenagers did in the eyes of the impotent police. To remedy the situation, the city government passed a law banning licking frogs."
the frog And the poison frog are generally only once in life to lick you