Flying Saucer Kim's Game
Have a bag instead of a tray, with your 20 objects in it. You need two guiders for this. One person takes the article out of the bag and tosses it to the other Guider, who holds it up, names it and puts it in their bag (or throws it back to the bag holder, which ever works for you). After all the objects have done their flying saucer act the girls have 5 minutes to record as many of them as they can.