Newer model Subaru Outback is a good example. It looks something like an SUV, but the shape shows that it descended from a station wagon, not a pickup truck.

Almost all SUV's are crossovers these days, including the three row ones. There are still some on truck frames like the Suburban but the market has almost entirely shifted. I assume they're cheaper to build that way, lighter, and also drive more like a car than a truck.

I think the big reason we see more unibody SUVs/trucks is that people don't need the body-on-frame rigidity as much as the automaker needs to meet CAFE standards (in the US at least).

Looks like an SUV from the outside, but based on a unibody. Not body-on-frame like traditional trucks.

It's a vehicle that is larger than a car but smaller than an SUV. They generally look like tiny SUVs

Examples would include the Toyota RAV4, Jeep Renegade, Audi Q5, BMW X1/X3/X5/X6, Ford Edge, Nissan Juke, and the beloved Pontiac Aztek.

SUV = built on top of truck body/platform; these are almost extinct

crossover = looks like an SUV, but is built on a car body/platform and thus generally smaller