The calculated distance (air line) between Zürich (Kreis 3) / Friesenberg and Frauenfeld is approximately 23 miles respectively 37 kilometers.
By car or train, the actual journey to Frauenfeld is certainly longer, as only the direct route (as the crow flies) between Zürich (Kreis 3) / Friesenberg and Frauenfeld has been calculated here.
Air line (approximately)
37 kilometers
20 nautical miles