Question

why was the frog angry?

Answer 1

Because now nightingale could not sing well so the creatures lost their interests in listening to her so the income of frog came down which makes him angry

second method to answering..
Frog angry because the nightingale did not sing cleary and other creaturewill hated voice of nightingale. .. This reason may be frog was angry

Answer 2

Heya....!!!

HERE IS YOUR ANSWER

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Frog made nightingale practice day and night and even in rain. Because of this the quality of the nightingale's song got worsen.Creatures of bingle bog now no more have any interest in listening nightingale's song. This led to a subsequent clash at the cash counter. As now frog couldn't earn much,he got angry.

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HOPE IT HELPS!!!!