of course. I’ve cut a few hundred signs in oak, walnut, and cherry, among others. Oak will sometimes warp a little, depending on where the board was milled from the log and how much material you’re removing. Pine will warp so ridiculously sometimes (like 1.5" of warp in a 10" tall sign) it’s completely useless. If it’s a structural piece, like for instance the crib shown above, pine is probably a good choice, as the structure will keep the wood from warping too bad. If it’s for a free standing or board sign pine is sometimes more trouble than it’s worth (for me). Sure, you can hit it with a heat gun on the necessary side and try to get the warp out, but that’s not really an option in a high production environment. You can also rip the pine and flip the grain on every other board and join them together to minimize the effect, but again that’s too much work for me. I still use pine from time to time, but on hanging signs I usually choose other woods that make for less labor.
I did a larger clock recently which I use pine for the face (3/4") and used a 3/4" OSB backer to try and keep the face from warping. I used pine because of weight, as a 1.5" oak clock would have weight nearly twice as much. Since it was a 30" face it would have been 40-50lbs or so, too heavy to hang for most people. Even with the backer I still ended up with a pretty crazy warp in the clock, around 1/2" or so. I was able to use the clock still, but it was disappointing - again burned by pine.