Any person can report a crime. Depending on the age of the person (under 18) the police will want the involvement of the parents or guardian as soon as possible. The juvenile officer or unit the police will be involved, and probably DYFS if the parents/guardian cannot be located. Good luck.
DISCLAIMER
While I do practice law in your State, this answer is provided solely for informational purposes only. This answer does not constitute legal advice, create an attorney-client relationship, or constitute attorney advertising.