Aww... not gonna lie, bit disappointed in this one, what with all that's going on in the world. Was looking forward to Brother America going full villain mode.
In Japan the game is called jan-ken, you say "Jan-ken-pon!" when getting ready to throw, and the moves are guu (rock), choki (scissors), and paa (paper).
(FWIW, the *more* commonly used name in Germany is "Schere, Stein, Papier" (scissors, rock, paper). There's a *number* of alternative "names", however - which are said aloud when playing so as to "sync" the players.)
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