A parroter; a person who repeats the words or ideas of others.
A transponder.
A kind of bird, many species of which are colorful and able to mimic human speech, of the order Psittaciformes or (narrowly) of the family Psittacidae.
To repeat (exactly what has just been said) without necessarily showing understanding, in the manner of a parrot.
One who adopts a passive approach, or passivism.