Oh this'll be good. How, exactly?
The lagoon roll is, as much as I don't love the name, a different element to the barrel roll (if you're not sure, I suggest looking it up). The death roll is a barrel roll.
I agree with
Kw6sTheater, it should be called a barrel roll downdrop
Yes, it is just a barrel roll. Colossus is pure heartline rolls, where as the death roll seems to have some upward pitch extend-ment during it's navigation, creating more negatives than would be there if it was purely heartlined.
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I didn't name the element. I think there are other elements with stupid names. I was merely trying to point out the origin.
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Edit:
Barrel roll - generic name for roll, from my understanding
Jojo roll - right out of the station
In-line twist - not heartlined, big shaping and force difference
Heartline roll - heartlined roll, colossus is a great example
Zero-G roll - roll designed to pull zero g's. Probably heartlined and at the top of a hill. could also be called heartline camelback
barrel roll down drop - barrel roll in place of standard drop
death roll - barrel roll down drop not acting as the initial drop out of the lift
lagoon roll - two heartline rolls of opposite rotation, where the degree of rotation is not quite 360 degrees. the first one stops before 360 degree rotation, and goes immediately into a roll the opposite way.