Tangramables : A Tangram Activity Book by Martschi
This book has some activities in the front and then it has pictures that are under the tangrams. I bought it used from Amazon and it included tangrams that were for an overhead projector, they are transparent. He can place the tangrams on the pictures and see the picture through the tangrams. Eventually he will be able to determine the shape of the object, but for now he can minipulate the shape and gain those spatial math skills.