There are two alternative animals with two heads (bi/dicephalus) and animals with two faces on one head (diprosopus). These are all examples of present at birth cephalic disorders, i.e. genetic disorders that guide to anomalies in embryos.
Two mouths, two noses and three eyes, living two faced cat
A two-headed albino rat snake
A two-headed albino Honduran milk snake
A turtle born with two heads and an extra set of legs between them
The two-headed calf
A two-headed baby crocodile
A two-headed sheep
Two headed bobtail lizard
Two-headed Greek tortoise
A two-headed American Rat Snake
Two-headed calf
A Hereford calf with two joining heads
A two-headed young tortoise
A two headed blue tongue lizard