First Transmission by B. R. Louis

Saving an alien planet is nothing compared to meeting your sales quota.
Marcus Aimond, untrained tag-along aboard humanity's first intergalactic exploratory commerce vessel, has a singular mission: sell off-brand misprinted merchandise.
When the rookie and his crew encounter the Nerelkor, a frog-like civilization, he is thrust head-first into an alien civil war. The opposing factions, Rejault and Dinasc, are stuck in an ill-fated feud driven by deep-rooted ineptitude. To avoid the planet's total annihilation and establish a local sales office, Aimond and the crew must survive arena combat, reshape the very structure of the planet, establish world peace, and stay alive-for the sake of positive branding, of course.