Back on Track: While looking through his telescope, Frog notices that Kangaroo's mail train is headed straight for a broken track! He has to rely on Bear and her tiny new tricycle to get him there to fix the track on time. And if the tricycle isn't tiny enough, Dog, Duck, and Ant and all his cousins climb on board to lend a hand. Will they make it in time? The Rainbow Birthday Cake: It is Frog's birthday, and Duck wants to make him a big, beautiful birthday cake frosted in the colors of the rainbow. Such a cake requires lots of cans of frosting, and Duck learns he can't just throw cans anywhere-they must be recycled. In WordWorld, recycling means using the letters in a discarded word to make other words, such as can-dle-which is just what Duck needs for Frog's cake!