I just finished reading Bernard DeVoto's "The Journals of Lewis and Clark" where one of those two described that incident. Later on, they saw the same thing done with buffalo intestines.
Some years back, in a book on the Western Indian Wars a buffalo hunter described how the squaws cut the intestines into small sections, dipped their knife in the liver, added a drop of bile to the gut, and handed it to the kids. He said they chowed it down like it was candy.
That is exactly what learning what chitlins are (just looked it up) made me think of! Although I read about the journals in “Undaunted Courage”. Intestines are only for life and death starvation situations!