Place one cake round onto the cake board.
Using the cake frosting, pipe a thick outline around the edge of the cake. This will be the barrier to keep the pudding in the middle.
Pipe pudding into the middle of the cake layer.
Place the second cake layer on top of the first one. Repeat steps with the frosting and pudding with the second cake layer.
Place the third cake layer on top.
Using the remaining frosting, frost entire cake.
Sprinkle the toasted coconut onto the bottom of the cake.
Pour the caramel sauce into the squeeze bottle and squeeze it along the top edge of the cake that way the sauce drips down along the sides.
Using the remaining frosting in the piping bag, pipe dollops of frosting along the top.
Sprinkle with toasted coconut and place a Nilla wafer cookie against the frosting dollops. Sprinkle toasted coconut on top.
Place in the fridge for 1 hour to allow the frosting to harden before cutting into slices and enjoying.