The naming of developers and developing agents seems to have gone through different fashions. For a white -ol was popular but so was -gen as in Kalogen and Eikonogen. The connection between developer names ending in -ol and chemical structure seems a bit felicitous. Strictly speaking in chemistry the suffix -ol applies to only alcohols as in methanol, ethanol, propanol, etc. There are many chemicals that contain the -OH group such as sugars whose names do not end in -ol. The use of the -ol ending is an interesting question to which we may never get an definitive answer.