1. Do you know that the main reason why frogs call or make noise is to attract a mate. It's their signal of giving a hint to make love with the opposite sex. WOW! They either call or make noise individually or in a group (chorus). All these call or noise are produced with the mouth closed.
2. In other times, frogs call because they know that a rain will come. They have the ability to detect humidity cues prior to rainshower.
3. Sometimes, frogs call when they are in danger. When producing the sound, their mouth is open and the sound is high-pitch. It is suspected that it drives away predator because the sound also attracts an animal that distracts the predator.
So, everytime you hear a frog calls or makes noise, you will no longer amuse why do they make such noise. Just imagine like this; a frogs sweet call is like a boy's whistle to a girl he likes. aheeem.
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