Apple knocker is a term used to describe someone who is inexperienced or ignorant. Synonyms for apple knocker include naive, unsophisticated, greenhorn, novice, neophyte, newbie, rookie, and tenderfoot. Each of these words describes someone who lacks knowledge or expertise in a particular field. While apple knocker may have originated as a term in the fruit industry, it has come to be used more broadly to describe anyone who is inexperienced. With these synonyms, you can avoid using the derogatory term apple knocker and instead find a more appropriate word to describe someone who is just starting out or may need more help and guidance in their endeavors.