MISCHIEVOUS TYKE is a term used to describe a young child who is mischievous and often gets into trouble. The crossword solutions for this term are ELF and IMP, both of which are three-letter words. ELF is a mythical creature from European folklore, usually depicted as a small, mischievous humanoid with pointed ears and a cap. An IMP is a small demon or mischievous sprite, often found in folklore and fantasy literature. Both ELF and IMP are commonly used to describe mischievous children.