Rumor: Mario Kart World will have a 120 FPS Mode.

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rapsuperstar31 said:

Metroid Prime 4 with 120fps as well.. Would be crazy if Nintendo goes from games struggling to run 30fps on the Switch 1, to all of sudden Nintendo is pumping out a bunch of 120fps games.

Most first party Switch games didn't struggle to hit 30fps; many were a solid 60 (Splatoon 2/3, Mario Kart, Smash, ARMS, Metroid, etc) and those that targeted 30 generally got there the vast majority of the time.