Not in the way you are using it.
That's not a castable spell, so you can't cast it over and over. It is a proc on the epic weapon, so there is a limit as to how often the pet will be cast. While you could see a ton of pets out there, it won't be the numbers are you were seeing by a long shot (a dozen would even be a stretch, though it is possible if you're lucky).
But regardless, yeah it still is really cool. Swarm pets were just recently corrected by KLS in the code. Previously, they liked to crash zones