Taking treats to his grandmother (``bugs and thorns and peppercorns''), a little goblin has mutually terrifying encounters with a bunny, a mouse, a butterfly, etc. Johnston makes the most of this familiar scenario in an artfully cadenced text with classic repetitions, nicely rounded in a cozy conclusion: ``Greeny'' and her grandson make cookies together. In Degen's deft, broadly rendered illustrations, the goblins are appealing rather than scary. Not important but fun. (Picture book. 4-8)