Two Puerto Rican tree frog siblings learn about science and social studies topics during their adventures on their island home in this chapter book series. It's time for Carnival Puerto Rico's joyous holiday is full of sights and sounds to explore. Rosi is determined to show Rafi the best way to enjoy the parade, while Rafi has a plan to make his sister queen for a day. But when Rafi scares Rosi with his terrible vejigante mask,...