Yeah, Bergan has played in every game. He's been a valuable piece for depth and should start next year, or be the 3rd DT in rotation behind Kamara and T. Williams.
DJ Taylor has been back for 2 games. Pretty incredible recovery from mono.
Krukow, yes, those seem to be the only 2 that are right at 4 games. At least, they are for defense. It's tougher to figure out offense, but there really haven't been many freshmen playing on offense (other than the obvious with Hartman and Sciba). Mike Edwards is one I'll ask about, because we heard he'd be used in FG/PAT for his size in the last 4 games, but I can't remember seeing him on the field.
Injured guys back from bowl, off the top of my head: Colburn will be back (talked to him Saturday, will have a story on him up today). I think, and this is just an educated guess right now, Amari Henderson could be back. I'd say Ja'Cquez Williams will probably be back. Smenda is a maybe (reason for his absence for the last 2 games is unknown, I think). ...
And that makes Hartman the huge question. Given how Jamie has played at State and Duke, that Sam's foot was in a boot for at least a week, I'm doubtful Sam will return. To me, it doesn't seem worth it to put a hobbled QB back there to run RPOs. Hell, that's why Wolford didn't play at Clemson last year.