Nope, they just can't be made prone by tripping them.
I'd have to check the spells/etc to see what they specifically say, but here's an example where thry would definitely be prone.
Creatures that take lethal damage from a fall land in a prone position.
Oh here's another one:
Fall: On its turn, the subject falls to the ground and remains prone for 1 round. It may act normally while prone but takes any appropriate penalties.
Grease and Stumble Gap are more similar to a trip attempt than the two I posted, so there may be specific text about a bonus to the relative saves (or immunity to those spells), but I don't know well enough.
It's worth noting that the ghosts (and similar creatures) who are immune to being tripped would also be immune to most of these. That's correlation, but not necrssarily causation.
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What's the difference between a purple worm and a "prone" purple worm? If you can't describe a meaningful difference then there's no such thing as a prone purple worm.
It would be more consistent rules language to say "immune: prone" instead of "can't be tripped", but sometimes you have to apply common sense.
Incorporeals are a specific case:
They can’t perform trip or grapple combat maneuvers, nor can they be tripped or grappled. In fact, they can’t take any physical actions that would move or manipulate an opponent or its equipment, nor are they subject to such actions.
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A prone purple worm could be like a snake on its back. I would imagine that a snake on its back would have difficulty biting someone (-4 to melee attacks). Snakes like a cobra that spit venom may not be able to do so when they are on their back.
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What's the difference between a purple worm and a "prone" purple worm?
What's the difference between a prone cobra and an upright cobra?
Right.
How about tripping said upright cobra? Not really likely, or meaningful if it was even possible.
Arguably, a snake that is laid out prone could count for purposes of the penalties associated with that condition. Which kind of makes sense too.
Tripping is a mechanic that has a bunch of baggage associated with it. There are abilities that grant AoOs against something that gets tripped, for instance. Not really fair to apply to a snake, or a purple worm. So those creatures are immune to getting tripped in the first place, but aren't necessarily unable to be prone. Being tripped is being subject to an action. Being prone is being in a state. Not the same.
Immune to prone? No, not generally.
But on a case by case basis, as a GM, I might make that the case.
Immunity to trip only means immunity to the Trip combat manuever. It doesn't mean that they're immune to being forced into the prone position via other means, such as with a Grease spell, or an Overrun maneuver, or Bull Rushing someone off a ledge and having them fall prone from taking fall dmg, etc.
A prone purple worm could be like a snake on its back. I would imagine that a snake on its back would have difficulty biting someone (-4 to melee attacks). Snakes like a cobra that spit venom may not be able to do so when they are on their back.
Ah yes. And what would a prone ooze or other amorphous creature look like, by that logic? I'd argue by the definition of prone, a snake is always prone. Just not mechanically.
RAW, they're separate things. Common sense dictates certain things can't be prone.
A prone purple worm could be like a snake on its back. I would imagine that a snake on its back would have difficulty biting someone (-4 to melee attacks). Snakes like a cobra that spit venom may not be able to do so when they are on their back.Ah yes. And what would a prone ooze or other amorphous creature look like, by that logic? I'd argue by the definition of prone, a snake is always prone. Just not mechanically.
RAW, they're separate things. Common sense dictates certain things can't be prone.
This game doesn't make a distinction between Supine and Prone, and they really should. I'd argue that a snake *could* be considered prone while it's supine. This isn't RAW of course, just my opinion.