: What are these called? Is it appropriately correct to say "cluster glissandi"? This is from Prokofiev's piano concerto number 3, the third movement.

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Wikipedia refers to these as "double-note arpeggi":

Then the coda explodes into a musical battle between soloist and orchestra, with prominent piano ornamentation over the orchestra (including famously difficult double-note arpeggi, sometimes approximated by pianists with keyboard glissandos using the knuckles)

There is a notated glissando earlier in the movement, one bar before rehearsal mark 98.

The double-note passages are clearly notated, rather than marked as glissandi, so it's clear that Prokofiev's intent was literal.
The fingering given in the Russian "Collected Works" at rehearsal mark 137 reinforces Prokofiev's intent.

Each double-note is to be played with a single finger, and each ascending and descending section comprises ten note-units (either singleton or double), thus being "playable" by the two hands acting side-by-side as ten fingers. ("Playable" being a relative term.)
The Isidor Philipp edition1 features an even less plausible fingering (IMO):

In this video of Martha Argerich with the Singapore Symphony, you can see her hands when she first encounters the double-note arpeggi (28:58). She uses a hand-over-hand technique. However, at 29:08 she uses a side-by-side technique. 1000 bonus points to anyone who can figure out what she's actually doing. :-)

1Serge Prokofieff, "Concerto No. 3 (1917-21)", ed. Isidor Philipp (1956, International Music Company).