Tie names to individual pigs for keeping track of what one we're verbing up (and anything else on streets where we have to execute more than 1 verb to make something happen). I'd take Pig 4 and Butterfly XII as long as the ones on each street have a unique name for that street. Always renaming captured pigs upon release would solve a minor issue that this would create.
On the other hand, it lends a "herding cats" difficulty to quests if they lack names.