List of Known 1-2 Switch Mini-games. Some were discovered during the live Nintendo Switch eventa.
Draw (Reaction speed game using wii motion, wild wild west style)
Samurai Training (Take turns stopping a sword with your hands.)
Milk the Cow (Enough said)
Count the Balls (Motion controls to tip a box, HD to help you guess the number of balls within)
Safe Crack (Motion controls to rotate the lock, HD rumble feedback to help you crack the safe)
Copy Dance
Eating Contest (Using the IR sensor next to your mouth)
Table Tennis (Air Table Tennis using sound alone with motion control and buttons to control spin)
Baseball (Baseball )
Sword Fighting (Fight with swords and lives)
Answer the Phone (Pick up the joycon quickly)
Air Guitar (rhythm game , could be using the IR controller to sense distance to your other hand as well as motion controls)
Magic Duel (Harry Potter style flinging spells)
Balance Yoga Game (keep the joycon stable and still)
Musical Statues (dance and hold positions)
Boxing (looks to be shadow boxing)
Shave (Have a shave)
Cat Walk (seems to be some form of posing game maybe with modeling walk type theme)
Clown Game (Looks to be a competitive button pressing event)
Russian Champagne Game "Soda Shake" (Take turns shaking the Joycon until it Pops, uses IR as well)
Pirate Treasure Game (Maybe balance, maybe wheel turning)
Lifeguard (Bay watch style running game??)
Baby (Wake up the baby Joy Con)
Sailors (Semaphore - signalling with flags)
Gorilla "Not been confirmed but user has seen a mini game at event"