"Long ago when tigers still smoked pipes..." a pair of naughty frogs always did the opposite of what their mother told them to do. This pourquoi tale explains why frogs always cry "Gaegul! Gaegul! Gaegul!" whenever it rains and why--in Korea--"children who don't listen to their mother are called chung-gaeguri or green frogs." Heo remembers hearing the story of the green frogs when she was a little girl in Korea. Her humorous illustrations suggest swampy, underwater, and microscopic images. They were created with oil paint and pencil and are reproduced in full color -- mostly shades of green. (Ages 3-8)