The phrase "little giant" is an idiom that describes a person or thing that is unexpectedly powerful or important despite being small in size. Some synonyms for "little giant" include "mighty mite," "pocket dynamo," "miniature powerhouse," "little titan," and "small but mighty." These terms all convey the idea that something or someone small can still possess great strength or significance. Whether referring to a person, an animal, or an object, those words suggest that even the smallest entity can have a big impact, proving that size is not always indicative of strength or power.