The Quack Frog By Aesop’s Fables

No Moral. Suggest us a moral of this fable in comment section.
A Frog once upon a time came forth from his home in the marsh and proclaimed to all the beasts that he was a learned physician, skilled in the use of drugs and able to heal all diseases. A Fox asked him, “How can you pretend to prescribe for others, when you are unable to heal your own lame gait and wrinkled skin?’