Name of the mammal that lays eggs and has scales?

Answer 1

There is no mammal which lays eggs and has scales.

The only egg laying mammals, or monotremes, are the platypus and the echidna. The platypus has fur, and the echidna has fur and sharp spines.

Answer 2

Reptiles are the only group of animals that usually have legs, have scales all over their bodies, and lay eggs.

Note that birds do have scales on their legs, but only their legs, and they also lay eggs.

Answer 3

Fish.