Fortunately, context is a powerful thing, and what had Tidus more baffled was 'you don't need to feed it, but also you should probably feed it' that he received. Like yeah, no kidding, President Obvious!

And look at this guy, making them wait. Both him and the higgledy, of whose name he'll need to ask Roland for again (Higger-be? Hibble-be-Bibble-be? Okay, now he's just confusing himself).

"What do you like to eat?" Tidus decides to ask the higgledy instead. And considering it's all...water-like in appearance. "Fish? ...seaweed?"