According to Encyclopedia of Organ Stops, "The Fugara is a string of 8' or 4' pitch, popular among German builders of what Audsley calls the “later school”. It is made of open metal or wood pipes, sometimes tapered."
If you are interested in getting to know as many organ stops as possible, you should look into Encyclopedia of Organ Stops, created by Edward L. Stauff. In many cases you can listen to the sound samples of the stops you're interested in. It's the most comprehensive source about organ registers online.
Edward would be a great person to be interviewed for our Secrets of Organ Playing Podcast.