Process vanilla wafers in a food processor into fine crumbs; transfer to a large bowl. Process peanuts in a food processor until finely chopped; add to the crumbs.
Stir 1 cup powdered sugar, whiskey, honey, peanut butter, and salt into crumb-peanut mixture. Form mixture into 20 1 1/2-inch balls.
Whisk together cocoa and remaining powdered sugar in a shallow dish. Roll each whiskey ball in cocoa mixture to lightly coat. Chill for 15 to 20 minutes before serving.