Hello Janice, what a fun set! I think the hole is to let steam out and may well be a tea infuser, just a guess. The one with the retractable lid is classified as a syrup dispenser....the other two could be sugar pourers, but I can't see them clearly enough to be certain. They might even be salt and pepper dispensers??
They had a green and yellow part-set like this on Etsy a while ago....did you see that one?