Please keep in mind da origin of these references. - Teal Tan Mudds

Contributing to age-old tension between the land-dwelling Naboo and the Gungans is the martial nature of the amphibious species. Although the Naboo do maintain a security force made up of loyal volunteers, they do not have a standing military force the size of the Gungan Grand Army.

When the Naboo and the Gungans joined forces to repel the Trade Federation invaders off their planet, the Grand Army employed their unique alien arsenal in the battle.

Gungans employed a variety of muscle-powered weaponry to deliver a specialized payload to their targets. Using the plasmic energy found deep in Naboo's porous crust, the Gungans have crafted a spherical grenade-type weapon they call a "booma," or boomer. These grenades are either thrown by hand, sling, or catapult. When they hit their target, their protective shells burst, releasing the liquid-like plasma and a powerful electric shock.

In addition to their boomers, Gungans also carry spears and lances called electropoles. This polearms can be used as missile weapons, or can be used as contact weapons that deliver an electric jolt.

For defensive purposes, the Gungans have adapted their hydrostatic bubble technology to form hand-held personal shields. These ovoid frames project a defensive screen of shield energy capable of deflecting blaster bolts back at the firer. (starwars.com)

The Atlatl is used to throw energy balls. It adds speed and power as an extension of a throwing arm, allowing the user to hurl energy balls farther then with just an unaided toss. If forced into close combat, the wielder can use the atlatl as aclub. (SWRPG, revised core rulebook)

Towed into combat by grumpy falumpasets are organically grown Gungan battle wagons. These primitive vehicles serve to resupply Gungan artillery pieces, like their powerful catapults. In the thick of combat, General Jar Jar Binks accidentally opened the cargo ramp of a fully loaded battle wagon, spilling huge Gungan boomers (or boomas) onto the battlefield. (starwars.com)

Though the Gungans are naturally powerful swimmers, they do rely on submersible vehicles to travel the depths of Naboo's waters. One of their most striking technological achievements is the Gungan bongo submarine.
Sporting the distinctive organic lines of Gungan technology, the bongo's manta-shaped hull is organically grown through secret Gungan techniques. Hydrostatic bubble shields keep the cockpit and cargo areas dry and filled with air. A semi-rigid assembly of tentacle-like fins spins to provide the bongo with thrust. From a distance, the bongo resembles an exotic Naboo squid or similar creature of the deep.(starwars.com)

The Cesta is a flexible pole used to hurl small energy balls. It can also be used as a melee weapon. (SWRPG, revised core rulebook)

Among the ground weapons used was this organically crafted Gungan catapult. Having the same "grown" look as the rest of Gungan technology, the catapult was pulled into battle by slow but reliable falumpaset beasts. When in place, the catapult hurled plasmic energy balls -- or "boomas" as the Gungans call them -- at the enemy.(starwars.com)