This is mentioned in Millikin's book on Foxx. Interesting it was mentioned on Wikipedia earlier this week, but can only find it here:
"Jimmie Foxx played for town teams during his early years in baseball. He played for the Easton Farmers, a minor league team managed by Frank "Home Run" Baker, after being invited to a tryout by Baker. Foxx's early experiences in baseball, including playing for local teams, laid the foundation for his successful career in Major League Baseball."
Wikipedia
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