蝦夷方言藻汐草

Batchelor explicitly lists Wakka-pop for a water spring, and separately gives pop for bubbling up. Wakka pop is a transparent modern division of the recorded expression; wakkapop remains a joined comparison. The full dictionary sense matches 水の湧, although the historical record itself does not mark word boundaries. NINJAL’s exact wakka pop corpus example means water boiling; the spring judgement rests on Batchelor’s separate lexical entry.