What I grew up calling a Swede Saw were all variations of this steel bow saw.
If it had a square frame, usually wooden, we called it a bucksaw
www.bensbackwoods.comSwede saws we sometimes used for felling as well as for bucking up our wood, the buck saw was not normally used for felling.
The advantage on both of them is the thin ribbon blade does not bind in the cut very much.
By the time your cut is deep enough to close the pinch point is at the top of the cut.
The back of the saw blade is usually deeper in the cut than the pinch point, so you don't need to wedge the cut open or to cut from the bottom.
I should have mentioned taking a piece of old garden hose or something and splitting it to use as an edge guard. These blades are usually very sharp when new and will slice the hell out of your gear if you are not careful.
You should also release the tension on a bow frame if you are storing it.
However, if the bow frame gets bent and does not put enough tension on the blade then the blade can be taken off, the frame bent open a bit to increase the tension, and the blade put back on.