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Actually, yes, it's also called the Mexican Salamander or "walking fish". This one looks a bit more like the guy you spotted:

1024px-Ambystoma_mexicanum_1.jpg

These creatures are so cute! I really want one!

They are an uncommon, somewhat exotic pet. But, you could get lucky and find 3 next to a dumpster aquarium, like this couple in Washington State:

https://www.littlethings.com/axolotls-rescue-broken-tank/