This is an older model I made quite a while ago, but it does the job. Based on the classic Lego alligator, though slightly different.
Works similarly to the shark, in that it is hostile and will eat players. What is different is the ability to walk on land, lack of cool shades, and it spawns in a variety of green colors.
Note: The alligators seem to have trouble stopping their walk/swim animation. If I fix it then I will update.