12 sturdy board books feature early learning concepts--including colors, numbers, and shapes--with Kermit, Piggy, Fozzie, and friends Muppet Babies promote imagination and friendship, which makes learning fun. 12 sturdy board books feature early learning concepts--including colors, numbers, and shapes--with Kermit, Piggy, Fozzie, and friends Muppet Babies promote imagination and friendship, which makes learning fun