A Field of lush crops, are those husks looking at me? Art by Nick Cross
Scarecrow
Mostly based on folklore
While manny spooky tales exist about Scarecrows, the most well known is the chapter from Scary Stories to Tell in the Dark labeled "Harold" made in 1981. Harold was described as a beaten straw-stuffed scarecrow wearing moth-eaten farmers slacks with a hole in his stomach exposing the wooden post that he hangs from. Other myths include the Japanese KuneKune, a paper scarecrow that appears far away in cornfields blowing in the wind. If you stare at it too closely, you go insane and only laugh and move like the KuneKune. In d&d, Scarecrows are animated humanoid shaped sacks stuffed with straw and knives. They are bound to an evil spirit, that follows its creator's tasks and moves the frightening construct.
In Mythology
Harold the scarecrow, made by Stephen Gammell
The Japanese KuneKune