As NYCDAD indicated, schools communicating with freshmen and sophomores is typically done through a 3rd party, such as the HS or travel ball coach.
The coach relays the message to the recruit and the recruit can then initiate a phone call to the college coach. Unlike softball and many other Division I sports, D1 baseball coaches can accept an incoming call from a prospect at any time.
However, D1 coaches aren't permitted to provide a written scholarship offer to a recruit, directly or indirectly, until August 1 of the recruit's senior year.