Quaghead Tribe, Saints of Thuvaraiyam

From publisher blurb:

Tattooed thugs and honor-bound heroes, shiftless anarchists and romantic wanderers — the Crocodile Knights are called many things across the wetlands up and down the Grey River, and “Quagheads” is among the more polite. They rove between villages on crocodile-drawn watercraft, unload illegal cargo and intriguing boasts at every stop, and adhere to an opaque charter of strict taboos.