
You have 2 very active breeds in one there so he is going to need to be kept occupied with different activities.
The highest value treat I have found is cubes of very mature cheddar cheese, never found a dog yet who has preferred something else to the cheese, what you are offering has to be of higher value or the dog won't comply.
Does he connect you taking the ball/frizbee as the end of the game? Would he be happy carrying it home as his reward at the end of the game?
It can be hard when the dog has been trained using different commands to what you are used to giving.