Another possibility is that the disks might for for PC/MS-DOS.
Commodore did produce a cross development system which used the MS-DOS Lattice C compiler. I have a set of those disks which I think I dumped a few years ago. If they're not already available I could upload the files somewhere.
If I remember correctly, the labels on my disks were different to those on yours, printed with a dot-matrix printer. I'll try to find them tomorrow and take some pics.