It is called a 'croak', and its onomatopoeia in American English is 'ribbit'.
i'd say it's a croak
ribbit
kreaking
A sound is produced when a metal blade called a tangent strikes the string.
Bawling
Oink
Bray
RAIN DEERS GRUNT
The sound you are referring to is called borborygmi.
reverberation
In a stringed musical instrument, the part that vibrates in a resonance with the sound waves produced by the strings is called the sounding board.
A physical property of matter that can be produced by vibrations is called sound. Sound propagates through a medium such as air or water.
no
A sound that's produced by a single wave at a constant frequency and with no overtones is called pure sound. This means that regardless of other characteristic properties such as amplitude or phase, the wave consists of a single frequency.