I made a texture pack! So, it's pretty simple. This pack replaces the Cyan Axolotl with this beauty. Yeah, it's real. The green axolotl was shown, but never added to the game. Really sad. But, several people have attempted to add it. My issue is most require Optifine and/or are weird colors. What about Sodium players? And is a nice neon green so hard to make? Well, here we are. It was effort, but I think it is my current best work. It looks like something that could get added, which is what I wanted it to look like. I will be the first to admit that I am not Jasper Boerstra though.
Tested and works in 1.17, and 1.18 vanilla or modded.
If you want a better version of this with both glow axolotls in one pack, here you go: link