Roller skates tend to be the wheels set in like a box format. A wheel on each corner of the shoe. Roller blades are when all the the wheels are in a single line. Wheelies... the wheels are more embedded in the sole of the shoe and, no offense to your bulging biceps, tend to be for a lighter weight.
Man, if Elsa was still here, we could make a layer of ice. Or if there's anyone who has some earth magic.