Some have olives as well, I tried it myself years ago. Mortadella is delicious though in the US there are two versions for sale. I forgot which, is the one that is a bit too dry and not to my taste. In my 40s now I stay away from processed meats as much as I can.
I see this marketed all the time as olive loaf here in Appalachia. There's a lot of Italian influence here in the coal fields, but most of the Italian product names have died off.
But I am talking about the fourth image: https://upload.wikimedia.org/wikipedia/commons/f/f2/Mortadel...
Mortadela_com_azeitonas.jpg
Auto translate tells me that "azeitonas" [Portuguese (Brazil) detected] translates to "olives" in english.