They're not frozen, they are just tight as that type of tapered fit stud & hole will be. First, avoid hitting the studs head-on at the thread end or on the nut, that will only mushroom (swell) the bolt/stud and make it an even tighter fit. The correct way to get them out is to use a big BFH and smack the SIDE (!!!!) right next to where the stud passes through. It may take several heavy whacks but the stud WILL pop out once you hit it correctly & hard enough.
The studs in the antiswaybar pop out the same way but the antiswaybar gives so much (is springy) that that method doesn't always work when the antiswaybar is in the vehicle. Removing the four bolts for the two brackets under the plastic cover that hold the antiswaybar to the Jeep & placing the ends of the antiswaybar into a heavy vise so the ends can't move will allow you to smack the sides hard enough to pop the studs free.
Trust me, this method works... don't give up on it too soon. The below photo shows the 'hit it on the side' technique being used on the tie rod end which uses the same type of tapered stud fitting.