User blog comment:Milesprower2/Cob Cannons aren't lobbed shot plants!/@comment-26531060-20121201094516/@comment-5792287-20121201095147

Lobbed means throwing, and the Cob Cannon doesn't throw, as you say, it launches missiles into the air.

On top of that, it doesn't have a steady rate-of-fire as it is a manually activated plant.