Who put the Snarfdoodle in my Lunchbox?

The Snarfdoodle snorts and he snarfs and he brays, His purple fur glistens from the dusk's gloomy haze. His single eye twitches in the middle of his head, As he stretches his legs and his arms round my bed. The Snarfdoodle lives in a cave on a tropical island in the middle of the Doodle Sea. He is a very naughty monster who gets up to all sorts of mischief. Only children can see the Snarfdoodle, which leads to even more fun and games! He is under your bed or hiding in your lunchbox, popping up just when you don't expect it, snoring noisily, messing up the house when Mom and Dad aren't watching, and even eating homework! But the Snarfdoodle can also help you learn to count, and will always be there to make you feel better when you are scared or lonely.