The Tankceratops is a character in Final Fantasy VII. A weird monster created by the fallout of the explosion of the Gongaga reactor. Spends its time between the party (this party is not a regular party in a strange way...) , trying to have an action figure in its weirdness, and advertising its brand of cyanide.
After being found by the party in Gongaga, it makes sporadic appearances onward, typically with its biggest fan Tifa involved. Notably, when the sky-tram on the Gold Saucer was broken, Tifa enlisted it's help to escape by riding on it's back as it slid down the tram-lines.
In the original game, it is simply known as the [|Heavy Tank.