Answer:
Little boy
Step-by-step explanation:
A simple subject is the word that tell who it what performs the action of the sentence, the simple subject is usually a single noun. A noun is the name of a person, place, thing, or idea. In this instance, the noun in this sentence little boy. A Young Male child. In this sentence the little boy is licking the ice cream cone, licking is the verb quickly being the adverb.