toadeater

Etymology
, said to allude to an old alleged practice among mountebanks, who would hire a boy to eat (or pretend to eat) toads, which many had considered poisonous. The toadeater (or "toady") would pretend to writhe in pain, until the quack gave him some "medicine", and then try to impress upon the crowd that the boy was cured. Compare.

Noun

 * 1) A fawning, obsequious parasite; a mean sycophant or flatterer.
 * 2) * 1819, J. Wilson, Complete Dictionary of Astrology "Horary Questions", Of Theft.
 * a chaplain, tutor, toadeater, or some superior servant