Concept: Bullistics Frog
Description:The Bullistics Frog is a large creature living in swamplands where the dangers are many. They have built up natural offensive/defensive weapons against both attacks from the ground and air, and are captured and/or raised in the captivity by sentient species to use as weapons of war. The large airsack on their throat can hold air at high pressure which is realeased through the vents on their back. The frog, or it's handler can place items in the opening on the front of these vents which then get released at the speed of a cannonball. Each vent has independant muscle structure to allow for controlled pressure release. The Bullistics Frog has large back claws and strong rear legs to avoid being pushed back upon pressure release and to use as defensive weapons when pressure loading is too slow due to immediate danger. They also use the airsac to float rather than having to swim to stay aloft and like to spend their time at rest floating around the deep swamps.
"Can't" is a coward too lazy to try.