Creg Ganim is a NPC in Divinity: Original Sin 2.
either poem only set attitude 20 on 3 traders
If you request an original poem from him then the 3 nearby traders (Adam, Rennard, and Vaila) will give you +30 reputation each. Not sure if it had to be an original poem or not. Not a bad result for a 75 gold donation (after a speech check).