Probably not most because many of the Bolens attachments use a driveshaft power takeoff. Most others don't. Pictures and more descriptions would help us to know what you are talking about. Good Luck, Rick
If you are talking about attachments made for other brands like Cub Cadet, Sears, etc, then the answer would be no.
However, that's not all that big a problem, as most of the commonly used attachments, like tillers, snow/dirt blades , snowcasters, etc. are pretty easy to find. Bolens made the tube frames for 17 years, and with just a few exceptions, any tube frame attachment will work with any tube frame from any year. Of course, you wouldn't want to try to use a 42" deck with an 8hp G9, but it will mount.
Also, since Bolens made the tube frames series for so long, the attachments are probably easier to find than the ones for the other brands that changed their basic tractor style mot often.
Now there are other attachments made by people like Brinly-Hardy, Ohio Steel, and others that use an industry standard sleeve hitch. Those attachments can be used on a tube frame if you have the sleeve hitch attachment.