It would not be a surprise to hear “foul ball” or “dead ball” or “time out”. It might be normal in some venues. I have heard the latter 2, one in the CWS and one in MLB. Nobody was surprised. In a DH I call “foul”, second game my partner calls “foul ball”. Non event. Guys that were brought up hearing “foulball” don’t seem to be able to change it and it doesn’t matter.