Fairy tales are sagas in a way, yet we have made a separate page for fairy tales here. We see a big difference, because fairy tales are much longer and more detailed than sagas. They are novellas, so to speak, where sagas are short stories.
Like sagas passed down orally for centuries, fairy tales were collected and retold by various authors in the 19th century. Most important are certainly the brothers Grimm. In addition, there are fairy tale collections by Andersen, Hauff and others.