It is worth keeping in mind that "STOL" is a peculiarly military thing involving reduced speed factors for takeoff and landing with significantly increased risks in the event of one going quieter than the other(s).
Civil aircraft which are represented as being STOL are not in that they observe normal certification standards (in the main) ... however, they have low stall speeds, excellent high lift systems at low speed, good roll control, etc. ... and have, as a result, shorter than "normal" takeoff and landing distances.