When do the hordettes appear?
They appear alongside the horde. If one appears, then so does the other. Historically, only the horde is counted, and then you know the number of hordettes as well. And the reason for this type of counting is because the horde arrived slightly before the hordettes and made an armed impression.
Did the Vikings have Vikettes?
Why not? The Dutch had Dutchettes, recognizable by their closets full of wooden shoes (klompen).
One would think that. But, no, not really. Because technically the term 'viking' wasn't the people in, or from, Scandinavia. It was for the people going viking. Hence, a vikette would actually be a Viking as well.
The difference between a Viking, and a Norseman, is that the first is what he currently do, and the second is a group of people. For example: A Viking is a Norseman who go in viking (seafaring trade, raiding, or settling foreign land).
Intend attacking at dawn high water.