Rat babies are called kittens, but I call them ratlings, or ratlets - kittens seems a bit of a silly choice!
They can be called pups or kits.
Kits or Kittens
An adult rat is called a rat.
They are called nestlings.
it is called proturding
quadruplets
maybe because they are also called the "grass cutting rat"
chicks
Quadruplets
If it is a male rat then it become sterile.A castrated rat is a sterile rat.
They are just called baby mere cats.
A male rat is called a buck.
it is called a flying rat
A small rat is called a pup