Amy and Clarissa Series by Eleanor Estes

Old Witch, Little Witch Girl, Weeny Witch, and two real girls in a fantasy that blends the worlds of reality and imagination. A Halloween classic about the power of make-believe.

Jimmy McGee is a tiny, leprechaun-like man whose peaceful life is disrupted when he rescues Amy's doll Little Lydia from a monstrous wave that sweeps her off the beach. Can Jimmy find a way to restore Little Lydia to her original state as a "do-nothing doll" before he returns her to her rightful owner? From the bestselling author of Ginger Pye comes the quirky story of a little man who saves the day in a big way.