Remember that Potter was very respectful of just about everyone under him. He admitted that he was wrong when he mistreated Klinger in "Period of Adjustment".
If Klinger, Radar, or anyone fr that matter, swore too much, they'd get reprimanded for it.
Anyone that watches even some M*A*S*H knows that Potter was the type of commander that would never expect anyone to do that he himself couldn't, or wouldn't do.
Ooops. Didn't finish.
If Potter swore, but no-one else could, he might feel a bit guilty about something that he could do but others couldn't.
Therefore I suspect that part of the reason for Potter using phrases like Mule Fritters, Buffalo Bagels and all where were out of respect of others.