It is believed to be COLOCASIA esculenta 'Mojito' Taro

Water from the fountain will have the benefit of all the nutrients in
the stale pond water with the added oxygen from being aerated.

So far I cannot find out if COLOCASIA esculenta 'Mojito' Taro can be treated as a bog plant or if it needs drainage.

I haven't grown "Mojito" but all the other C. esculenta I have grown were okay in saturated soil and also in well drained (but moist) soil.

This summer I put half of elephant ears in well draining soil that was frequently watered and the other in a small basket of soil made for aquatic plants in a tub of water. The ones that drained were huge. The other was stunted by comparison. Of course I can't tell what would have happened if the soil basket had been larger.