Q:

Is there a way to delete creeps? 

Is it possible to delete created creeps?  Either through a script or through the GUI? 
I could not easily find a way to do this, but it seems like a simple functionality so I imagine it exists, or someone has thought about it or something. 

A:

You can use Creep.suicide method. 
for(var i in Game.creeps) {
    Game.creeps[i].suicide(); // lemmings style! 
}

