Dorohedoro Vol 1

Dorohedoro Vol 1 by Q Hayashida. An Action manga rated Older Teen, published in English by Viz Media in 2018.

In the grimy city of Hole, sorcerers from another dimension use the locals as test subjects for their magic. Caiman, a man whose head was turned into a lizard's and who remembers nothing of his past, hunts them down with his friend Nikaido, searching for the one who cursed him. A gory, darkly funny fantasy.