What's the name of the black hexagonal dinosaur?

I used to raise a fat one. I called him Big Fat. Give him any name if your little six has any characteristics, such as little black and black eggs.

Mexican blunt-mouthed salamander (English name: Axolotl), also known as American salamander, commonly known as hexagonal dinosaur, is an aquatic amphibian and endemic to Mexico. The natural environment can only live in muddy waterways and lakes. It is famous for its unique appearance and juvenile sexual maturity. That is to say, even after sexual maturity, it will not undergo changes to adapt to the land, and still maintain its aquatic shape.