is it possible that i would be able to make a mod on my mac? not sure if i can or not? is there an app or anything i could do?

Yes, I believe there is a mod making function within Toribash itself. I'm not sure how I got to it but I was able to make one on my Mac. I use a MacBook Pro and the Steam version of Toribash. Use TextEdit to modify the nitty gritty stuff instead of Notepad though when you change the code. Make sure it's in Plain Text Format though. That's under the Format button on the menu bar I believe.