Hedgie’s Surprise by Jan Brett.
What you need to know about this story is that there is a tomten in it. The main antagonist, the one causing all the trouble, is a tomten. There are not a lot of children’s books out there that require me to look up one of the first words in the story! Perhaps this just speaks to my poor Scandinavian folklore education. Apparently (according to Wikipedia) a tomten, or tomte, is a “humanoid mythical creature of Scandinavian folklore.” In this story, the tomten is a very small, troublesome little scamp who resembles an elf. And a rotten, selfish little elf-thing at that. Every day he barges into Henny’s coop and steals her eggs. She begrudgingly tolerates this until she realizes that if she could keep the eggs she could have baby chicks! But despite her best efforts, she cannot keep that tomten away.
Happily, Henny’s friend Hedgie the hedgehog (I know, these names are not up to Jan Brett’s usual standards) helps devise a cunning plan by hiding the eggs and replacing them with various other edibles, until at last Hedgie hides and gives that tomten a prickly surprise! This is not the book Jan Brett is best known for; it’s a perfectly good read and the images, as always, are lovely. Great for kids 4-6.