Gotham introduced us to Jonathan Crane early in the form of Charlie Tahan. He appeared in two episodes of season one along with Julian Sands playing his father Gerald Crane. At the time, Gerald was the one making the fear gas and Jonathan got hit by it. This season started with Jonathan returning and fully taking on the mantle of Scarecrow, and we even got to see him in the costume. But Michael Ausiello over at TVLine is reporting that the show is looking for a new actor to take over the role.
This is not a new thing for the series, which started off with a few younger villains to go with a young Bruce Wayne (David Mazouz) and Selina Kyle (Camren Bicondova). Take the character of Ivy Pepper, who started off being played by Clare Foley for seasons one and two and was then aged up by an Indian Hill escapee. The role was played by Maggie Geha for season three and the start of season four, and when she returns later this season she will be played by Peyton List, who also plays Lisa Snart, AKA Golden Glider, on The Flash. Making the concept of swapping out Tahan for another actor isn't that far-fetched.
Ausiello points out that the show could also be doing this as a cover to get an actor for a different villain role. I agree that is possible, as I wouldn't think they'd swap actors once they got them into the classic-looking costume. This could easily be them covering up the casting of another major character by saying that it's for Scarecrow. But if they are changing Cranes, will the story be part of the new Poison Ivy arc?
Gotham is on its mid-season break and will return in Spring 2018.