I’ve seen the terms “frame saw” and “bow saw” used basically interchangably. The only difference I’ve noticed is ones with a smaller blade are usually referred to as bow saws, and the smaller blade is useful for cutting curves. As far as I can tell, if you put a wider blade on a bow saw it’s now a frame saw. Maybe someone else can point out any distinction I’ve missed. But I do know that for resawing you’ll want a wider course-toothed blade, very low TPI. Smaller/thinner/finer blades will not do well.