Killer Croc in Batman: The Animated Series.

Born in the slums within the everglades of Flordia, Waylon Jones had a rare condition that gave him reptilian-like skin. Viewed as an outcast he became a thief and was placed in juvenile hall. In juvenile hall, Jones killed an inmate with his bare hands who made fun of his appearence and was sentenced to jail. Paroled after 18 years, he found work as an professional wrestler and took the name "Killer Croc". He stole the wresting promoters money, escaped to Gotham city and became a master thief, extortionist, and murderer.