In this game Billy Bob has to pick up some food on his way to the Cornslop family reunion. So use the d-pad or A/Y to move the truck and squash the armadillos. Don’t hit the porcupines or you’ll damage the truck. Once squashed, drag the armadillos into the truck with the stylus.
Thanks to http://www.nintendomax.com/viewtopic.php?t=13607&f=19 for the news.