This is a simple one-balloon crocodile that you can make. The only video I could find of this type of crocodile is in German. If you just watch him, you should be able to do it.
Balloons – Crocodile

This is a simple one-balloon crocodile that you can make. The only video I could find of this type of crocodile is in German. If you just watch him, you should be able to do it.