Not under water, on shore the croc is dead meat to a tiger, ever notice why crocs run for water when big cats approach on shore.
That armor does not stop several hundred lbs per square inch of jaw pressure behind 3 plus inch canines, in fact the salt water croc has a soft spot at the back of its head where the skull is thin, and tigers learn from their mothers to exploit it. The size of the croc does not matter out of water, they are slow lumbering and helpless at that time.
People who dont know any better hear some crap on TV about the armor on crocodilians being so tough, I can tell you that its not that hard for them to lose entire scutes, get punctures from other animals, or even simple human hunting impliments.
In fact many crocs are killed by poachers with small caliber pistols, and 22 long rifle rounds, they trap them and shoot them in the head, the armor doesnt do anything to stop it, in fact a 22 LR penetrates deeper in a crocodilians head than into a cows head.
I recently had to assist in removal of a 22LR round from a large alligators head, it was fired at a angle that caused it to penetrate through scutes, and several inches through skull and brain before stopping near the jaws.
Never underestimate possibly the most sucessful single mammal predator design, the cat.
Black caiman which get enormous, and orinco crocs are on the jaguaars usual menu, they stand no chance, the jaguaars kill them by a single bite through the skull, just like a tiger does.
In fact theres a video if you so are inclined on youtube, a full grown male tiger (average around 8-9ft long) killing one enormous salt water croc out of water, the croc is twice his length.

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