Murray the Mole

 was a promotional animal for the Little Lamplight caverns.

Appearances
is only mentioned in Fallout 3. Also, the item Kid's Cave Rat Outfit and Kid's Murray the Mole Hat are pieces of clothing in Fallout 3, embodying the mole mascot of Little Lamplight that can be seen above the entrance of the caves.

Location
can be found on a sign above the entrance of Little Lamplight.