In a mixing bowl, blend together the yellow cake mix, oil, eggs, water, and coconut pecan frosting until smooth.
Fold in the finely chopped pecans into the cake batter.
Spread the batter evenly into a greased 9x13-inch baking dish and bake for about 40 minutes at 350°F.
While the cake is warm, melt unsalted butter and sweetened condensed milk in a pot over medium heat. Stir until combined.
Stir in the chopped pecans and spread the praline topping over the warm cake.
Notes
For leftovers, store the cake in an airtight container at room temperature for up to 3 days or refrigerate for longer freshness. Flavor variations include nut-free options or adding a chocolate twist.