Naked mole rat  also known as sand puppy or desert mole cat.But the fact is that it is nether a mole or nor  a rat.
Naked Mole rat (photo courtesy:Roman Klementschitz)
It is classified in the genus Hetrocephalus , and is the only species to be classified in the genus.
It is the first known mammal discovered which shows eusociality (learn more).

It is not a rat as it does not belong to the genus Rattus  and also does not belong to mole genera.