Krohm has been active in German film and television since the 1970s, with appearances on Tatort, Derrick, and Der Alte. He appeared in the British co-production miniseries Traffik and in the film Help, I'm a Boy! He dubbed James Gammon in Silver City and Altered, Peter Hambleton as Gloin in The Hobbit movies, Jeffrey Tambor in Superhero Movie, Richard Griffiths in The History Boys, Brian Doyle-Murray in The Three Stooges, Mac MacDonald in Flyboys, Roger Ashton-Griffiths as Hitchcock in Grace of Monaco, and Ian McNeice in Day of the Dead.