croaker

Noun

 * 1) One who makes a croaking sound.
 * 2)  A vocal pessimist, grumbler, or doomsayer.
 * 3)  A frog.
 * 4) A fish in the family, known for the throbbing sounds it makes.
 * 5)  A doctor.
 * 1)  A frog.
 * 2) A fish in the family, known for the throbbing sounds it makes.
 * 3)  A doctor.
 * 1)  A doctor.