The Thessyx seem reasonable to approach about these creatures, as they're native to this land, so going to them first through Remi is totally a valid approach!

However, yeah, if Remi is too slow or there's no clear answer from the Thessyx and the creatures are causing havoc, Trish is on Steve's side of nebulously volunteering and dealing with it in a way similar to however her fellow Hatchlings choose (which is looking to be a free for all). She's on the destruction side, personally...they're hideous, so her sympathy level for them is at minimum hahaha.