Snakes swallow prey whole
And snake are related to crocodiles. Thus, given the right conditions, crocodiles could potentially evolve the ability to swallow prey whole. This would likely leave their overall strategy, jaw strength, speed, and hunting tactics (and therefore their design) relatively unchanged, because:
Strong jaws will be required to hold large prey so they can't escape while the croc swallows them-not sure if a second pair of jaws or "walking" jaws like a snake would be more feasible/work better for this
Speed and camouflage will allow them to surprise prey, which is logically key to swallowing prey whole for a croc
Why swallowing whole?
After a certain point, it's more energy-efficient. Sure, snakes sometimes get food poisoning or indigestion from rotten meals, but seeing as how crocs regularly drown their prey and let it rot before they eat it, that shouldn't be an issue for your Gorger croc. (It's either Gorger or Deathjaw in my mind, but you go with what works for you.)
How would it work?
Recurved fangs, first and foremost. This would prevent prey escaping, as recurved fangs hook into the flesh and punish escapees with terrible wounds. (Think of it like having fishhooks for teeth.)
Secondly, swallowing. As mentioned above, snakes can "walk" their jaws over their prey, which pythons and anacondas can do to great effect in order to get prey down the hatch. (For more on that, please click here.) However, as constrictors use this on already-dead prey, this likely won't work on struggling prey.
Another option is a set of pharyngeal jaws, like moray eels or xenomorphs, which would literally grab prey in the mouth and drag it down into the stomach.
Finally, you could give it a gape like a shark or thylacine; thylacines had the widest gape in the animal kingdom, and a shark's biting mechanism is pretty much perfect for gulping down prey. If a shark won't work, then go for Dunkleostus.
If you still want your crocodiles to tie up prey, well, not much options there, but I can try:
Legless lizards are a thing, so why not crocodiles? Then they could tie up the prey with their own body! At that point, though, they'd be constricting...
With a big enough croc, or small enough prey, they could store unfortunate victims in a pouch, much like pelicans, until they get hungry again and swallow the captive prey
Tentacles can wrap and bind prey, so give your crocodiles a long, prehensile tongue (which would basically be a tentacle, and would of course be in conjunction with a throat pouch) and this could work...as long as you can explain it
Bipedal crocs with flexible digits, capable of using tools, is not something I currently have any ideas for. I simply don't understand how this could or would develop, but if I figure it out, I'll edit it in.
Hope it helps!