Is there a concise and recognized terminology for the types of turnouts shown in these photos? The switch points and closure rails are one rigid unit that rotates on a central pivot to change routes. There is no frog in the conventional sense.
The photos are Marx and prewar American Flyer items. Not strictly tinplate but the design dates from that era.
An advantage of this type for toy trains is that wheel gauge and flange thickness standards are less critical for reliable tracking. Plus, they accommodate Marx "fat wheels".