 Krohn mostly preferred not to write under his foreign surname, but either adopted a nom de plume or worked as part of a collective, such as the fennomans, of which he was a leading member.Using pseudonyms, he translated many of Johan Ludvig Runeberg's works into Finnish, and researchers also concluded that he penned the Finnish lyrics for the Finnish national anthem.Under his most notable pseudonym Suonio he published poetry; e.g.