Answer

In Jain Ardhamāgadhī Prakrit, pakkha (पक्ख) is the word related to “pankho”. It can mean wing / feather, and in some contexts also fan. ( jainqq.org)

Explanation

So if you are looking for the Prakrit form of pankho, the closest Jain Prakrit word is pakkha. The exact meaning depends on the context. ( jainqq.org)

Takeaway

pankho = pakkha in Prakrit, commonly understood as wing, and sometimes fan. ( jainqq.org)