Tadpole's PromiseTadpole's Promise is a 2003 British children's picture book written by Jeanne Willis and illustrated by Tony Ross. It won the Nestlé [Smarties Book Prize] Silver Award and was longlisted for the Kate [Greenaway Medal].PlotA tadpole and a caterpillar fall in love. Despite promising to never change, the tadpole grows arms and legs and becomes a frog. The caterpillar becomes a butterfly and is eaten by the frog.