@jlmjr1957
You can create DMS images of the disks, it doesn't matter if they show as NDOS. I did this myself, the first disk is a DOS valid diskette as it's the one you need to open to start the toaster installer, the other ones are in a special format that only the toaster installer recognizes. Be aware that some of the disks are High Density, so you will need a high density floppy drive to read those and you will need to use the 'HD' switch in DMS when creating the dms images of those. The toaster installaton software comes in 45 disks, of which 16 are high density (30 to 45).
Hope that helps,
Dragster
Edit: The above was meant for toaster disks version 4.x... 3.1 could be a bit different, maybe less disks, or no high density disks. The rest should apply the same!