According to wksexcrimes.com, "A minor found delinquent (“guilty”) of committing child on child sexual abuse by a juvenile court is subject to a broad range of treatment, from home probation for a specified period of time to custody in a juvenile justice facility until the age of 25, depending on:
The severity of the offense;
The risk to the public; and
The delinquent minor’s needs."
Technically, yes, you are able to report them to the police. However, before you decide to take legal action, please consider the severity of the offense and if you are at all exaggerating the situation.