Any ideas for a Kindergarten Halloween party with a duck theme?

Crazy, right? Well, I have to make it work for 24 5/6 year olds for one hour. What on Earth am I going to do??

There are 3 KG classes. One class is the ducks, one is the frogs and the other is the pirates. We were supposed to agree on a theme for the grade and, of course, Pirate Mom wanted to do pirates, but that it isn’t fair to the duck and frog classes. (Hey! Mr. Dean’s class is the pirates. We’re the ducks, not the pirates!) The idea of doing room-themed parties was tossed around, but what the hell do you do for frogs or ducks?

We decided on spiders. Yay. Oh, wait. Pirate Mom decides last minute that it will be pirates for her room so Frog Mom and I are kind of stuck. At least Frog Mom can work with a swamp theme or something.

I need crafts, games and most of all a way to tie all of this in to Halloween. HELP!!!