koro-koro
A small, round object rolling along a surface. Also describes something changing frequently or a cute, plump appearance.
💡A ball on the floor — 'The ball rolled koro-koro across the room.'
ボールがころころと転がっていった。
The ball rolled koro-koro away.
The marble rolled ___ across the floor.
ビー玉が床を○○と転がった。