Place chocolate and Biscoff spread in a heatproof bowl and microwave in 30-second increments, stirring between each, until melted and smooth. Cover and place in the fridge until set, at least 2 hours.
Place coconut in a small bowl and set aside. Take chocolate mixture out of the fridge. Using an ice cream scoop, spoon, or melon baller, scoop out a section and form into 1-inch (2 1/2 cm) balls with your hands. Roll each ball in coconut.
Store truffles in the fridge in an airtight container. Take them out of the fridge 15 minutes before serving so they'd be soft.
Truffles keep well in the fridge for up to a week, or in the freezer for a month. To thaw, leave them in the fridge overnight.