Keyhole - George Morrison - Bog

Keyhole is a humorous sci-fi novel for the adult market. People who enjoyed Spaceballs, The Hitchhikers Guide to the Galaxy, or the Discworld series will delight in my book.
When Nick, a short red biped from the planet Ghoul, loses his job as a gravity tech on a starship, the grifter Egrog asks him to join a caper promising to make them both rich. Nick has a gambling problem and is deep in debt to the vicious loan shark Urk. If he misses one more payment, Urk will make him an involuntary organ donor on the black market, so he agrees to Egrog's proposal.
Aided by a poetry-obsessed AI unit, they bumble from one predicament to another, getting captured by cannibals and being pursued by a curmudgeonly dragon as they close in on their goal. But when the end of their quest is in sight, they stumble across the source of the galactic government's revenues-trade in a powerful narcotic, a secret that puts them in greater danger than anything Urk could devise.