Pangolin are one of the few manufacturers on Pandora that does not produce guns. Their shields provide higher capacity, true to their namesake, but at the cost of a longer shield recharge delay. In Borderlands 2, they offer incredibly high capacity shields (easily over twice as high capacity as other shields) at the cost of lower max HP.
The pangolin is a primarily nocturnal, insect-eating mammal which can curl into a ball for protection, and has a thick coat of scales (modified hair) to protect it. This natural protection is no doubt what inspired the manufacturer's name.