Oh jeez. The size disparity would be incredible there.
Just a simple breath could knock sprites out of the air and rattle their little houses. I don’t think Jacob would even be able to see the little guys unless they sat still and he really squinted. Even then, he’d have trouble hearing them, while the rumbling of his voice alone could physically hurt the poor sprites.
Probably a good thing Jacob didn’t grow to giant size anywhere near Wellwood.