I don't think he's called for a while, so this may not be timely, but:
There is a caller to the Ron and Fez show who goes by the handle of "Fred from Brooklyn" who is a lot more coherent than TBSOWFMU's Fred, but who's voice sounds almost identical to me. I'll get a sound clip the next time I hear him for comparison, but I was going through the photos on ronfez.net from a recent event and found this:

There you have it. That's your man. Fred from Brooklyn.