Prepare and bake the cake according to package directions in a lightly greased 13x9" pan. Let cool combpetely in pan ( about 30 minutes )
Crumble the cake into a large bowl. Scoop frosting over the cake crumbs. Sprinkle with 1 cup each coconuts, and pecans, stir gently , just until thoroughly blended. Using a small cookie scoop, scoop cake mixture into 1 1/4" balls, roll in your hands , then place balls on wax paper-lined baking sheet. cover and chill 1 hour.
meanwhile, combine remaining 1 cup coconut, and 3/4 cup pecans, stir well. Melt chocolate for dipping, 1 package at a time. Dip chilled balls using a fork, and allow excess chocolate to drip off. Place coated truffles on wax paper-lined baking sheet . Sprinkle tops with coconut-pecan mixture; chill for 30 minutes. or until set. Place truffles in baking cups.