This is Gyoza!  He is an axolotl - a type of neotenic salamander (meaning they do not leave the larval stage and become land-dwelling). They're native to Mexico but are going extinct in the wild due to the pollution of their habitat. Pet trade axolotls like this guy can't be reintroduced though as they're crossbred with tiger salamander DNA and would be considered an invasive species! They're most commonly known for their amazing regenerative abilities and often used in scientific studies.

If you have questions about axolotls or are curious about what you need to keep one, please feel free to ask!