Using low heat, melt 4 ounces chocolate in a microwave (stir after 20-second intervals) or double boiler. Add creamer and brown sugar. Mix thoroughly. Set aside to cool slightly.
Add pumpkin, cinnamon, ginger, nutmeg, vanilla, and salt to melted chocolate mixture; mix well. Fold in pecans until just mixed. Cover and refrigerate for 30–60 minutes.
Form mixture into 1-inch balls, place on a parchment-lined baking sheet, and freeze for at least 1 hour, or until hardened.
In a microwave or double boiler, melt remaining 12 ounces chocolate and oil, stirring until very smooth. Remove from heat. Using chopsticks or a fork, dip each truffle in chocolate until well-coated; place on parchment-lined baking sheet. Refrigerate. Remove truffles from fridge 5–10 minutes before serving.