Pin the flower to the stem? or pin the strawberry to the bush?
Seeing as they are young you could sing hokey pokey but sing things like put your green thumb in/put your gumboot in/out. You could also play the theme song and play musical chairs - where everyone wins
Cupcakes with insects on top made of lollies - bees, ladybugs, butterflies, spiders.
Celery "grass" sticks and can't think of anything else!