The term "redcaps" is often used to refer to a type of mythical creature popular in British folklore. However, if you are looking for some synonyms for "redcaps," there are several options available that are more commonly used. For instance, you might use the word "gnomes" to describe similar creatures, particularly those associated with gardens. Another option is "hobgoblins," which are also known for their mischievous behavior and tendency to cause trouble. Some people might even use the term "imp" to describe these kinds of creatures, particularly those that are known for being small and malicious. Ultimately, the best Synonym to use will depend on the context and the specific characteristics of the creatures in question.