Most turtles in JJ1 only had one gun, but like the LFG 2000, it shot a variety of bullets. There were fireballs, yellow phaser things, RF missiles, and other weapons. It is not unreasonable that some of the enemies could have used Launchers, Blaster, etc, but didn't because that was not their weapon of choice. Like using seekers even if the level is filled with pepper spray.

And JJ1 does specifically say that Devan has a huge stockpile of weapons lying around. I don't know about the carrots.