Hey, As you know'Pimiento' means Pepper in Spanish If you want to say the plural, Peppers you say pimientos Hope this helps:) P.S Most words that are masculine will just need an 's' ended to the end of it.
Pickled peppers are peppers that have been pickled, like cucumbers that are pickled into pickles. Tounge twister was not intentional, but say that quickly 3 times! You can find recipes for pickling just about any kind of peppers online and I have added a couple of links to recipe pages.
Hungarian paprika, like all paprika, is ground into powder from dried pimento peppers. However, Hungarian paprika is generally made from a spicier variety of pimento than say Spanish paprika and therefore has more spicy heat.
Please don't eat the ornamental peppers! While they might not kill you, they were never intended for eating. Some sources say they are poisonous, others just say "don't eat those." So while the ornamental peppers are pretty and adorable, stick to the un-ornamental ones for your daily dose of heat.