It appears that Fontographer font utility supports import of TrueType fonts (.ttf) and can use them in making whole font databases (.fog) unique to the program. It is unlikely any other font manager can produce these .fog database.
Convert TrueType font file to Fontographer font database file.
We found 2 software records in the database related to .ttf to .fog file format conversion.
Apple macOS / Mac OS X software - convert ttf to fog on OS X
A font editor program
Convert from ttf file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned ttf to fog. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Multiplatform software - convert ttf to fog on any platform
Utility used to generate various types of fonts.