chirp, twitter, warble
哢 centers on the light, musical sounds of small birds: chirping, twittering, and warbling.
哢 combines 口 (mouth) with 弄, which likely contributes the sound and suggests playful or light action, together expressing bird-like vocal sounds.
A mouth 口 beside 弄, which looks like a bird playing with a twig. Picture a bird chirping and warbling as it toys with something.
For ロウ, imagine a row of birds on a wire, all chirping together: row -> ロウ.