ThedaCare, Froedtert Health to build hospitals in Fond du Lac, Oshkosh Oct 13, 2022 | Hospitals, Top Stories | ThedaCare and Froedtert Health plan to build new hospitals in Fond du Lac and Oshkosh as part of a joint venture announced Thursday. To access this content, you must purchase a Premium membership, or log in if you are a member.