Heat oven to 300°F. Line two sheet pans with parchment.
Arrange half the pretzels on the pans. Top each with one caramel candy.
Warm in the oven until caramels soften but don’t melt out, about 4–5 minutes.
Press a second pretzel on each to make a sandwich. Let cool 5 minutes.
Microwave chocolate and coconut oil in a bowl in 20–30 second bursts. Stir until smooth.
Dip pretzel sandwiches halfway in chocolate or drizzle over tops. Return to parchment.
Sprinkle with flaky salt and pecans while chocolate is tacky.
Chill until set, about 15 minutes. Serve or store airtight.