Changeling
In stories (folklore), a changeling is the child of a troll, elf, or fairy that has been left in the place of a human child. The stolen human child then lives with the troll family. A changeling is like a human baby but ugly, always hungry, and with a bad temper. Sometimes the changelings are much wiser than a human baby would be.
It is thought that changeling stories came from actual events. A family who had a handicapped or sick child may have traded their sick child for a healthier, better-looking child.
Folklore says that it might be possible for parents to figure out that their child has been replaced with a changeling. If they discovered the changeling quickly enough, they could get their human child back. One way to get the child back was to put the changeling in an oven. Another way was to put the changeling in a forest so that the troll could take its child back. Sometimes children died in the oven or forest.
Changeling Media
Der Wechselbalg by Henry Fuseli, 1781
The devil steals a baby, leaving a concealed changeling. Early 15th-century detail of "The Legend of St. Stephen" by Martino di Bartolomeo
Painting by John Bauer of two trolls with a human child they have raised
