In addition to what others have already shared, if you have the Digital Deluxe upgrade, it came with 'Awesome Animal Hats.' There's an Angry Lion hat your Sims can wear to get angry. Also, if you had TS3 and got the emotion lights/lamps, I'm guessing there might be one for anger. I never played TS3 so I'm not sure about that one, but thought I'd mention it. :)
Also, I saved this link to a thread on Carl's Sims 4 website a long time ago that has come in handy to me many times. It gives a list of every emotion and how to get your Sims in that emotion. It's an old thread though with mostly ideas to use from the base game, but thought I'd mention it anyway. :)
Emotions and Items/Actions That Influence Them