The only time I have ever heard Acorn Hill Breakdown is on the Jr. and Cody Marriott CD. I thought it was a fun tune, but I had no idea where it came from until I asked Cody, who said it was an old Missouri tune.
I dug a little deeper, and it looks like Tommy Jackson wrote it.
Acorn Hill Breakdown according to Fiddler’s Companion
ACORN HILL (BREAKDOWN). Old‑Time, Bluegrass; Breakdown. D Major. Standard tuning. AB. Composed by fiddler Tommy Jackson, named for the town his wife’s family came from. The tune appears to be a variant of “Soppin’ the Gravy .” Source for notated version: Cathy Cisco [Silberberg]. Silberberg (Tunes I Learned at Tractor Tavern), 2002; pg.1. Bee Balm 302, “The Corndrinkers.”