I’d just recommend a bright, cheerful game that requires little to zero reading and keeps to simple mechanics: New Super Mario Bros games, Mario 3D World, Mario Wonder, Yoshi’s Wooly/Crafted World, DK Tropical Freeze, Kirby Star Allies (Forgotten Land might be a bit more difficult or “dark” in tone for a toddler). You might find some good games that work on the eShop too.

Doom Eternal. Time to rip and tear, toddler!

Switch games aren’t designed for toddlers, by and large.

My daughter is 3 almost 4 and she loves playing Mario cart.