Mix the Butterfinger and Caramel: In a large mixing bowl, combine the crushed Butterfinger candy bars with the caramel sauce. Stir until fully combined into a sticky mixture.
Shape the Truffles: Scoop out a tablespoon of the Butterfinger-caramel mixture and roll it into small balls using your hands. Place each ball on a parchment-lined baking sheet. Repeat until all the mixture is used, then freeze the truffles for 30 minutes.
Melt the Chocolate: In a microwave-safe bowl, combine the chocolate chips and coconut oil. Microwave in 30-second intervals, stirring after each, until the chocolate is completely melted and smooth.
Dip the Truffles in Chocolate: Use a fork or dipping tool to dip each frozen truffle into the melted chocolate. Let excess chocolate drip off, then place the truffle back on the parchment-lined baking sheet.
Roll in Crushed Pretzels: While the chocolate is still wet, roll each truffle in crushed pretzels for a crunchy coating.
Freeze and Serve: Freeze the truffles for another 15 minutes to set the chocolate. Serve immediately or store in an airtight container in the refrigerator.