I see what you're saying, and agree with the mixed up taxonomy.

However, anything that isn't a true giant (P. adspersus) is, in common layman's terms, known as a "dwarf". There are many physical differences and it's quite apparent that dwarves are not simply small versions of the giants.

I think it would be interesting to get DNA samples of peoples dwarf pixies and compare differences. Looking at everyone's dwarves on here, there are a wide range of appearances and it would also be interesting to know what part of Africa they originated from.