They're all different, ou. I haven't done a day on my current program's frozen service, but others I have seen vary.
A lot of places you spend the morning reviewing slides with attendings, the afternoon grossing, and possibly the evening previewing slides for the next day. Frozens may interrupt you during the day. There are also programs where there is a separate resident just for frozens and so you don't get interrupted. Some places have PAs do frozens. Some places have it split up so you do grossing one day, microscope sign out the next. The extreme is a 4 day schedule where you do frozens on day one, gross in the rest day two, preview on day 3, and sign out with attendings day 4. A lot of times it turns into a balancing act, depending on when the attending wants to sign cases out. Often they will want to sign out in the afternoons so you have to get more grossing done in the AM or stay late.
Who grosses in derms depends a lot on the program. At some residents have to do them all. At others PAs will do most.
Weekend call also varies. Often someone will be on beeper call for either AP or CP (sometimes both together) for the entire weekend. Often this involves coming in at least once a day to take care of any specimens that have come in, take care of loose ends. (Usually a couple of hours depending on the program). If you have an autopsy you have to do that, although my program now has a separate autopsy only weekend call. But I don't know of any path programs where you have to stay in the hospital when you are on call. Maybe someone else does.