I used to call sriracha sauce "Rooster Sauce" because of the rooster logo. Also persimmon is one of my favourite fruits but I called it the "golden tomato that isn't a tomato" for the longest time. I also had a friend who used called the periodic table of elements the "patriotic table of elements" when we were in elementary school
I used to call a theatre Teeteer, and then I dont know what the actual name was, but there is a thing that can happen when u play football as a child If I remember correctly it has to do with the ligaments or muscles swelling and lifting off the bone(not sure what its called) but I used to call it Glaucoma of the knee.