Adarna Publishing house has a lot of pinoy storybooks that you might want to checkout. As for the book that can teach or introduce kids to Filipino language--Tagalog, you can check this book: Filipino Friends by Liana Romulo and Corazon Dandan-Albano. It is about a Fil-Am kid visiting the Philippines for the first time. In this book, he will be introduced to the culture and traditions of the Filipinos as well as the Filipino language. http://www.amazon.com/dp/0804838224/?tag=tagalog-lang-20
This children's book, aimed at kids ages 8 to 12, brings them on an exciting trip though some of the most fascinating islands on earth which our country the Philippines.They'll show you how kids in different parts of the Philippines come from many different ethnic groups and have very different cultures each with its own traditions, languages and belief and yet, they are all 100% Filipino!
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You can try scouring for books in National Book Store. I'm not really sure if they still exist but I remember I used to read fables, alamat and bugtong published in a thin booklet.