No, and they are not:
The Gendarmerie was the rural police (as opposed to the Gemeindepolizei in smaller towns and the Schutzpolizei des Reiches in larger cities). All of these were branches of the order police and (of course) wore police uniforms, with the various branches distinguished by branch colors (and a few other differences, like the color of their uniform facings and leather equipment, although that was later standardized).
These men are wearing army uniforms.