Blend watermelon slices so that they become liquid.
For half of the pupsicles, place a little of greek yogurt on the bottom then top with the watermelon juice, The do the opposite for the other half. Your pupsicles will look pretty cool since you layered them two different ways!
Put your tray in the freezer for 8 hours or until frozen.
Take tray out of freezer and pop treats out. Put treats in separate container to keep in freezer.