Sure you can! A 2D array should suffice. x could be mob names and then all the values on the y axis could be attributes for that mob. eg
(0,0) = Skeleton
(0,1) = resistance fire
(0,2) = rarity 5
(0,3) = HP 100
etc, and then the next mob is at
(1,0) = Gremlin
(1,1) = resistance water
(1,2) = rarity 15
(1,3) = HP 50
and so on. Just make a note for yourself somewhere of what each Y-coordinate is for. Ie (x,0) is name, (x,1) is resistance, (x,2) is rarity, etc.