Looking good!

I love the beasties! But I am more about the art of it all than play ability sometimes. I think in this case, its not a bad thing to have a few, as crocs or alligators would be common to swamps. DM can always decide if they are more a nuisance or use them in the campaign as they see fit. Its much more different than say beholder where you are forced then to write it into the campaign.