Birds and insects are able to swarm without telepathy, and the dynamics of this are fairly well understood. I don't think this is going to be such a big issue for drones; if anything, you'll get swarms of ultra-cheap tiny drones whose job is to swoop around chirping to each other until they get jammed, then take note of where the jamming signal seems to originate, GTFO, and convey that geographical information back to base at the earliest opportunity. The more enthusiastically you jam, the sooner you become the target of a ballistic mortar or guided missile that's fatally attracted to your jamming device.
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