From Folk Of The Wood,in Mandolin, Octave Mandolin, Mandola, Tenor Banjo, 6-String Guitar, 12-String Guitar, Dobro, Banjo, Dulcimer, Fiddle, Violin, Mandolin Crosspicking Lessons (great for Mandola & Octave), and Guitar Crosspicking Lessons. Phew.
Their web site is extensive. I found an answer to the nagging question:
A violin is a fiddle; a fiddle is a violin. There are no differentiating features period. The only true reason you’d call one instrument a violin and the other a fiddle is the approach…someone who plays fiddle tunes, a fiddler, will address their violin as a fiddle.