*puts on serious speculation goggles*
Let's see...
- For Toph, Crocodile has an inherent advantage, having a body made of sand means that he could, theoretically, blend into the environment and become functionally invisible to her. Gaara and Iggy have no such advantage (though they can fly, Crocodile may or may not be able to do the same). Toph could paralyze Crocodile, but then she'd have to do that while fighting Gaara and Iggy.
- Gaara has fire power, but can't do anything to Crocodile (if he uses ordinary sand); in fact, Toph, Iggy and Crocodile could take control of his sand and that'd be the end of it. If Toph decides to sand-bend him when he's on the defensive (as in Death Battle) or Crocodile grabs him at any time, then it's game over for him.
- Iggy has one advantage, that being that the others are unlikely to take him seriously (he's a dog, and they aren't Stand Users). Unfortunately, Iggy can't really do anything to Crocodile (except pee on him, I guess), and if he tries his usual tactics on Crocodile (trying to maul him), then he's dead.
- Crocodile is OP in a Sand war, the only advantage any of the others have requires them to be near a body of water (or injured enough to provide a source of blood). If they're fighting in a desert as one would assume, then Crocodile is damn near unbeatable. I believe Gaara's personal sand is infused with his mother's blood or something, so that could damage Crocodile.
It's difficult to say what order they'd go in, except that Crocodile is the strongest.
Of course, if Toph and Iggy brought Katara and Kakyoin (both of whom have water powers), then things change.
But if Toph and Iggy get back up, then so do Gaara and Crocodile; who'd bring Naruto and Mr. 1, respectively.
The fight would then probably end up being between Naruto and Mr. 1. And if Naruto has no way to break/cut metal then he loses the war of attrition.
(I'm taking this way too seriously...
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)