Prefolds - an oxymoron, yes I think so

[maz]

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Then there are the "All-in-One's" with snap-in soaker pads (boosters)

if there is a snap in booster you'll more then likely find they'd be AI2's because it can be used more then once (just snap out the used booster and pop in a new one)

As for prefolds.....I think from MPOV that they are so named as you prefold them ready to use...eg wash dry and then PREFOLD them into 3 even sections and fold at the crutch so its formed.