A turtle.
In water, on land, or in it's shell.
no a dolphin is a mammal and it does not lead an amphibias life style, it spends its entire life in the water
No snake is slimy. As to dry, that is difficult to define for an animal that spends its entire life in the water.
axolotl
The desert tortoise (Gopherus agassizii) lives in the Sonoran and Mojave Deserts and spends about 95% of its life in an underground burrow.
Amphibians, like frogs.
Maybe frogs.
During development of a jellyfish, this mysterious sea animal goes through a stage of having 24 legs and no eyes. A jellyfish spends it's entire life in the water.
Water
Salmon
a salamander is a amphibian and lives part of it's life in the water, but a snake is a reptile and has scales.
It is possibly based on the Copperbelly Water Snake.