Axolotls are submarine creatures in Minecraft that are a little difficult to find. They only appear in underground caves, deep underwater, so you want to bring a water-breathing potion or two when you try to dive into the depths to find them. Fortunately, they make a clear sound when you approach them. Even if you can’t tame the Axolotls, you can feed them and they eat a certain item that you can give them to try to breed them.
Axolotls in Minecraft only eat buckets of tropical fish. You can get a tropical fish and put it in a bucket by filling a normal bucket full of water, holding that bucket of water, and then applying it to a tropical fish while swimming nearby. You need to make sure that the bucket you are using is full of water, otherwise it will not work and you have to hold it. You can find tropical fish swimming around the ocean, or you can alternatively exchange a wandering merchant of five emeralds for a bucket of tropical fish.
If you have a bucket of tropical fish, take it to the Axolotl and make sure you hold it. The Axolotl will follow you as you hold the bucket, and when you hand it to them, you will see several hearts above their heads. You must wait a few moments before you can feed the Axolotl again.
The Axolotl will not be tamed even if you feed it, but you can give it a bucket of tropical fish to try to breed it with another nearby Axolotl. Alternatively, you can use your now empty water bucket to pick up the Axolotl and carry it in your inventory.