In Utah one of the Old Time traditional bands of 90 year olds were captured on film by the State folk arts council. They had fiddle, banjo, guitar and pitch fork played like a triangle with a wrench. It had a sound like a giant Teefer or french triangle. As to the triangle I've always assumed it was played in the french Canadian maner. I could imagine that the Minstrel shows had many things they did besides much like the tambourine and bones solos mentioned by Chris. I'm glad to find my wife and I are on the right track playing the Tambourine with Banjo. We did it because it felt right and then found many performers and historical reasons why the two were played together.
We got our jawbone at Lark in the morning. We've used wooden sticks, but Elaine normally ends up with a lap full of sawdust. We've tried turkey bones, and are currently using a ham bone. That has lasted fairly well, but the teeth have eaten through that as well.
Purchased my jawbone from Steve Weiss Music.