Only creativity puts a stop to what you can do with a frisbee (and our dogs-do-not-piffl-rule).
Throw the frisbee between each other and see how many you can manage without losing it. Make a course that each player must throw around, at least throw until the goal wins.
Stand in a large circle and throw the frisbee randomly between you. Anyone who does not manage to catch the frisbee gets a penalty point. Whoever gets 5 penalty points loses.