Couple things, first, there's a reason a head coach likes to keep most of his staff together. When you are teaching something new you want to have as many people familiar with it as possible to help with your culture and install of your offense/defense. I would imagine most of Frost's staff would come with him, except for a few guys. I wouldn't blame him one bit. "The best coach money can get" only gets you so far, as you have no loyalty to the coach, only the dollar, lose out on the things I mentioned earlier with "fit" to the current head coach, and someone will always outbid you.
Second, who would come over?
Chinandler is coming unless they give him the UCF job after Frost leaves
Austin is coming to coach the OL
Held will come here to coach RBs and would be in charge of JUCO stuff I think
Ruud may come and take over LBs
Duvall an Epley disciple would almost certainly come with him
I think his QB coach would come with him as well.
I've brought this up before, but Parrella will be an interesting case study. Frost is aware of how many directions he will get pulled with this job, he will have multiple people like Jason Peter telling him he needs to retain Parrella. I like keeping one or two guys from the previous staff to help with the transition.