what do you mean "agressive" ?
Bitting everything moving ?
High feeding response ?
Pacman frogs are so different from each other and they have so much different personnalities.
And the more they grow, the less the appetite is.
I already got 3 pacman frogs at my home and none of them was agressive...even none of them one was a big eater.
If you want to be sure to get a frog with high feeding response and very big appetite everyday, then get
an african bullfrog 