They played him with TK, Tippett and Farabee last season, as well as Atkinson, their best scoring forwards. They started him with Michkov this year.
I don't know what else they can do.
He's not a head case, no one seems to dislike him, it's just that Frost seems to have plateaued, a 3C who can be a 2C with wings who can carry him, but not a center who makes his wings better.
Sometimes a player simply isn't as good as fans want to think he is.
I'd point out that Poehling was #20, Frost #27, Poehling is 26, Frost 25.
So it makes as much sense to give Poehling a shot with better wings as watch Frost struggle.