true-type-fonts has 42 questions. ttf has 4 questions, two of which are double-tagged with true-type-fonts. I would simply clean this up to eliminate ttf except that there may be value in retaining it. We may get some users with a "ttf" question who don't know what it means or don't think of the translation at tagging time.
Granted, ttf hasn't gotten much use, but if we eliminate it, somebody may end up recreating it. I suggest synonomizing it with true-type-fonts, instead.