Kushidango is any dango on a skewer. Kushi means skewer.
What's the difference between kushi dango and sanshoku dango, other than sanshoku dango coming in three colors? The pictures I've seen online...the kushi dango looks the same to me. Because I've only managed to dig out kushi dango recipes.
Sheena, yomogi is all over Japan. Is it grassy tasting? Probably it is, but in a good way. Is moxa common in Korea? See this Wikipedia entry for details.