What is the sound made by frog called ?

Croak

The answer is croak.

Frogs make a variety of sounds, but the most common is a croak. The sound is made by vibrating the vocal cords in the frog's throat. The pitch and volume of the croak can vary depending on the species of frog and the purpose of the call.

The other options are not sounds that frogs typically make.

• Hoot is the sound that an owl makes.
• Grunt is the sound that a pig makes.
• Quack is the sound that a duck makes.