You can convert FRAME files to FBOK files using Adobe FrameMaker. Might not be possible for all version of those documents.
Convert Adobe FrameMaker interchange format to Adobe FrameMaker Book file.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert frame to fbok on Windows
Authoring and publishing software from Adobe
Convert from frame file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.