(Tock-)Tick is an unseen character of the Phantom Tollbooth. He is Tock's brother. He is the son of Tock and Tick's parents
Information[]
When Milo was asking Tock why his name is Tock when he ticks, Tock said that it was a long story. Before he was born, his parents named their first puppy Tick, but when they wound him up, he went "tock-tock-tock". So they named the next puppy Tock, expecting him to tock too, but he ticked. They tried to change their sons' names, but couldn't.