If the dates are hard, soak them for half an hour before beginning.
In the bowl of a food processor, blend the pecans until fairly fine (see photo below). Add the dates, coconut oil, nut butter, maple syrup, vanilla, cinnamon, cacao, and salt. Blend until the dates are completely smooth and the dough sticks together when pressed.
Form into small balls and freeze for half an hour. Roll in more cacao and serve. They're best if kept cold. Put them in the fridge for ten minutes before serving.