first time I heard the name was in the early 70's, Boone's Tout Rig. It was a double rig like a spec rig, but with double jig heads with shrimp tails. First time I took them out of the bag, my brother & I proceeded to catch 4+ pound trout, sometimes 2 at a time. We were impressed. That was 40 yrs ago in Big Lake.
I think the word Tout came from them and stuck.