It's not every day they see somebody trying to climb on the outside--they'd tried for fun once upon a time, but it got old and kept cutting their hands too much, so Frisk sticks to trees nowadays.
They're probably invisible from the ground, and their voice probably wouldn't carry that high anyway. Instead, they just stand in the shadows of the trees and watch.
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It's not every day they see somebody trying to climb on the outside--they'd tried for fun once upon a time, but it got old and kept cutting their hands too much, so Frisk sticks to trees nowadays.
They're probably invisible from the ground, and their voice probably wouldn't carry that high anyway. Instead, they just stand in the shadows of the trees and watch.