OK, I'm English and have never heard of a tamale or a chimichanga. I'm not too sure what a burrito is either!! I think I am going to have so many cuisine experienses at DLR in the summer (what with these, dole whips, bengal BBQ skewers, tigger tails!!) Now the turkey legs I have seen at WDW, but, man what size turkey has those size legs?!!
Oh my gosh, you are too cute! Okay, so you just reminded me of a funny comic of ours named Jim Gaffigan. He had a schtick where he explained what different Mexican foods are and said (for every one), "It's a tortilla with meat, cheese, and vegetables!
Anywhoo, I will happily explain Mexican food to you! (In exchange for you explaining treacle tart to me.)
A tamale is made of masa, which is ground corn that has been softened with salt and spices and made into a kind of dough. This dough is wrapped around pork, or beef, or chicken...or green chile...you name it, it's been done, and it is steamed inside a corn husk. You don't eat the husk, but you eat about a half dozen tamales when they're good!
A burrito is a flour tortilla stuffed with meat, or beans, or both, and lettuce, cheese, salsa, guacamole, you name it, it's been done.
A chimichanga is a burrito stuffed with meat and cheese, and then fried. The veggies that goe inside a burrito are on top of a chimichanga instead! My husband

chimichangas.
Hope this helps! (You owe me an explanation now!)
