Aim at the first pig on the helicopter. You may have to try this shot a couple of times to get the three stars, however this stage is not that hard and just require some luck.
Power Activation Point
Activate your Yoda power shortly after killing the pig.
First Shot Result
The super Yoda will bounce at the first wooden board, activate the bomb next to the pig, it will then drop the metal ball to kill all the pigs to the right of the stage. The Yoda continues to bounce around inside the area and killing all the pigs.