I know this game isn't as popular for speedruns as any others, but in my playthroughs, personal experience, and years of searching, the Folio Bruti does not appear as though it can be completed.

Specifically, the Dark Troll, Emerald Fire Crab and Doxy Queen are nowhere to be found, meaning the folio bruti cannot be completed.

I had the same experience with this game playing it casually; everything except the folio bruti can be completed. That is because the 3 monsters you mentioned cannot be encountered in the game.