Answer: Lots of Halloween goodies.
As Arthur notes, the Entamoeba ladies include Entamoeba histolytica and E. dispar. There are also E. moshkovskii and E. bangladeshi - all morphologically indistinguishable of course! The smaller Entamoeba was E. hartmanni.
The cupcakes were amazing - all courtesy of our Clinical Microbiology fellow, Dr. Rachael Liesman. As Yasir and Florida Fan mention, the cupcake with the pretzel stick represents Dracunculus medinensis, the Guinea worm, being pulled from a wound and wrapped around a stick. The equally clever cupcake right above this is a wound full of maggots. Yum. (they were actually delicious cupcakes).
Thanks for all of the great comments.