Ayolot

• The Mexican mole lizard (Bipes biporus) is a legless lizard that has two small front limbs that help it dig in the soil.
  It is also called ayolot, ajolote, or five-toed worm lizard.
  It has pink skin, a long tail, and a pointed snout.
  It feeds on insects, worms, and small animals.
  It is one of the few lizards that can vocalize, producing a squeaking sound when threatened.
  It is found in the Baja California peninsula and some parts of Sonora.

• The axolotl (Ambystoma mexicanum) is a salamander that retains its larval features throughout its life.
  It is also called ajolote, Mexican walking fish, or water monster.
  It has external gills, a flat tail, and four limbs.
  It can be white, black, brown, or albino.
  It can regenerate its limbs, organs, and even parts of its brain.
  It feeds on worms, insects, fish, and amphibians.
  It is endemic to Lake Xochimilco and Lake Chalco in Mexico City, but it is critically endangered due to habitat loss and pollution.

The animal you are referring to is probably the axolotl, also known as the Mexican walking fish.

Despite its name, it is not a fish but an amphibian.

It is also known for its remarkable ability to regenerate body organs and lost limbs.

The axolotl can grow up to 45 cm (18 inches) in length and can weigh up to 0.5 kg (1.1 lb) in captivity.

It feeds on various aquatic organisms, such as worms, insects, small fish, and even other axolotls.