Damian Lewis
Recently I re-watched the 2002 The Forsyte Saga
Damian Lewis as Marine Sergeant Nicholas Brody in Homeland
Aside from The Forsyte Saga, Lewis is best known for playing Marine Sergeant Nicholas Brody in Homeland 
Damian Lewis as Soames Forsyte from the 2002 version of The Forsyte
Soames is pretty much meant to be unlikable but Lewis brings so much pathos and sympathy to the role that I think he would make a great Frollo.
Damian Lewis as Soames Forsyte from the 2002 version of The Forsyte
He also excels at depicting a character whose repressed nature is in conflict with his internal passion.
Damian Lewis
As far as look goes, he seems like he could work for Frollo. Frollo seems to have an ever changing look where films are concerned but Lewis has angular face so I think he would work on that front.