I just use bug repellent without a ghillie suit and it works fine. Don't forget to use bug repellant on you and your mount if u bring one. And also be leary once you tame it if there are nearby bug creatures, they may ignore you but will attack the mantis right when it tames.
On Fjordur, you can find rocks in the volcano area that resemble fossilized Death Worms, which can be harvested for Death Worm Horns, making taming them much easier there, if you have the rest of the necessary equipment
Please don’t listen to the boy who said with bug repellant, ghille and cactus broth that the aggro range is “literally zero” cause it’s not.. you can get super duper close without aggravating it but you can’t get too close so still be careful and try not to stand so close you can touch it or it will STILL AGGRO.