Jirohnagi
Braava Braava
the first bunch were Gerudos and then as Ganon got more ghostlier, they were armoured brainwashed soldiers maybe??
That's what i view Darknuts as, Brainwashed soldiers. He upgraded from the Iron Knuckles to Darknuts.
I think the key difference is Ironknuckles seems to be more armored than darknuts, they were the trial and Ganondorf wanted brute muscle. Darknuts were created to be agile enforcers more so than brute force.
I do think Darknuts preceded Iron knuckles timeline wise.