King Putt's is a fictional miniature golf course in Seattle, located near an airport.
In iMight Switch Schools, Spencer was seeking a job designing a new miniature golf course. He constructed a series of sample golf holes, shot a video of them, and sent it to the person in charge of King Putt's, but he ended up creating an entire mini golf course, which Sam and Freddie charged kids to play in.
"King Putt" is a word play on "King Tut".