Definition of croaks:
(n) :
The call of a frog or toad.
(n) :
The harsh call of various birds, such as the raven or corncrake, or other creatures.
(v) :
(intransitive) To make a croak sound.
(v) :
(intransitive, of a frog, toad, raven, or various other birds or animals) To make its vocal sound.
(n) :
A faint, harsh sound made in the throat.
(v) :
(transitive) To utter in a low, hoarse voice.