Could Hedgehog or Squid projectiles work as air-dropped anti-submarine bombs?
Short answerOrdinary depth charges certainly did; he is not aware of Hedgehog or Squid projectiles being used that way.
NotesAircraft routinely carried depth charges and used the largest weapons their airframes could support. Those bombs were proven anti-submarine tools. Hedgehog and Squid projectiles belonged to shipboard mortar systems with different launch arrangements. No equivalent air-delivered use is recalled, so the answer distinguishes a known aerial weapon from a speculative adaptation.