Question

how did the frog tell the nightingale to puff up her lungs

Answer 1

 The frog told the nightangle to puff her lungs bcoz he knew that she will die by doing it. nightangle thought that she will b able to sing like the frog by puffing her lungs but she did not khew the cruel intetion of the frog. 

Answer 2

The frog rudely asked the nightingale to sing by puffing her lungs out and with passion so that more and more audience would come and he(frog) could earn money.