Toast the pecans in a dry skillet or 350°F oven for 7-10 minutes, until fragrant, then let them cool completely before chopping.
In a large bowl, stir together the melted butter, toasted pecans, brown sugar, maple syrup, graham cracker crumbs, vanilla, and salt until evenly combined. Refrigerate for 15 minutes.
Scoop the chilled mixture into tablespoon-sized portions and roll each into a ball on a parchment-lined sheet. Refrigerate for another 30 minutes.
Melt the chocolate in the microwave in 30-second bursts, stirring between each, until smooth. Let it cool slightly before dipping.
Using a fork, dip each chilled truffle into the melted chocolate, let the excess drip off, then set it back on the parchment and immediately sprinkle with the chopped pecan garnish. Let set 15-20 minutes before serving.