I THINK people have said that their MOC may call them to notify them of an appointment. USNA notifies MOCs of appointments so that the MOC can place a congratulatory call. A few days after notifying your MOC, USNA sends you the BFE.
However, MOCs don't as a general rule, know the status of their nominees. In other words, they only know who has been offered an appointment, not necessarily who is still waiting, has been turned down, etc. I suppose they could find out but I'm not sure they do.
Thus, I'm not sure that calling your MOC will do much good unless you have been offered an appointment within the past few days and just haven't received your BFE.