Flock is Planet Labs name for the mega-constellation of imaging satellites made up of 3U cubesats known as Doves- hence the name for the full constellation. It has nothing to do with the automated license plate reader company.

Their satellites have nothing to do with the street-level surveillance camera firm.

The latter I would think. I can see how you can confuse the two. The reason I think otherwise is because you don't name the satellite after one client, especially if you're in the business of selling images/data, not satellites. And a flock of satellites make sense for a name.