The croak of the little frog is a nursery rhyme. The name is Little Frog and the singer is Jin Zhuangzhuang. The lyrics are: "There is a little frog living in the pond, quack quack, green skin without tail, quack quack, all day long, growing up day by day, carefree quack quack quack, there is a little frog living in the pond, quack quack, big eyes without tail".