wait....when did Croc gain a tail?! damn i must be behind...
As for the reptile healing ability, I thought Croc just has a skin disease that makes him tough...not like he genetically became a half reptile/half human. That would take care of that reptile healing ability assumption. And as a reptile enthusiast, there's nothing quick about their healing at all. Even a lizard takes a sh*tload long time to regrow its tail (if it's a species that can break to begin with), and it never gets back to the same length.
I just post Crocs powers here.
Killer Croc's hide is extremely durable and thick, even moreso then his namesake's hide, and has been shown to turn bullets and pellets from penetrating his skin. His dermal layers are strong enough to protect him from common armed and unarmed blows, edged weapons, and ballistics, although Killer Croc's Reptilian Hide is weaker around vulnerable areas such as his eyes and mouth, although unlike a real crocodile Killer Croc's dermal layers are equally thick on his back, front and sides.
Killer Croc's claws and teeth are sturdy, powerful weapons that make him a vicious, primal foe in close quarters combat. His hands and feet are equipped with razor sharp claws, which allowed Killer Croc to slash his prey open at the first opportune strike. Rows of dagger-like teeth line Killer Croc's mouth, the tools of the trade for this cannibalistic man. His claws and teeth are more then able to cut throw protective clothing and has even punctured, or slashed open metal plating at times.
Killer Croc is strength is pretty awe-inspiring, on the low-end meta to human scale, as he has shown the ability to lift cars and throw them a couple dozen, or more, yards. Under extreme rage it is possible he could move, or lift, even greater numbers, but this would be under extreme circumstances and a rare event.