Chicken little has 3 different meanings across 2 categories:
a fictional character who was hit on the head with an acorn and believed that the sky was falling
The main character in this story, a hysterical young chick; (by extension) someone who resembles the character.
A children’s fable about a young chick who, in the traditional version, believes the sky is falling after an acorn hits her head. Also known by other names including The Sky is Falling.