I have made a quintet of crocodiles or alligators this summer (not sure what the difference is), but I've been having a lot of fun and I am sure you would to if you have the inclination!
Step 1: The magic of papier mache
To make my croc/allies I have used the technique called papier mache.
Before you begin, you will need to gather together your basic supplies, which are as follows:
slightly warm water
mixing bowl (lined with a plastic grocery bag for ease of clean-up)
the "bobbly" tops of empty egg cartons, (I used the plastic kind
many wire coat hangers
masking tape (I used several rolls!)
plastic grocery bags saved from the land-fill