J.K. Rowling's children's fairy-tale book published in 2020 is The Ickabog.
The story is set in the fictional kingdom of Cornucopia, a land known for prosperity and celebrations. Its title refers to a legendary creature that becomes central to the kingdom's fears and political manipulation. Rowling wrote the story years earlier, before publishing it during the COVID-19 pandemic.
In 2020, she released the text online in installments for children and families who were spending more time at home. She later published the completed book in print, with illustrations selected through a children's illustration competition. Rowling donated her royalties from the book to support charitable projects connected with the pandemic.
The Ickabog is separate from the Harry Potter universe. It is a standalone fantasy story with its own setting, characters, and political conflicts. That distinction matters because the title is sometimes assumed to be another Hogwarts-related work.