Yeah, it's a local thing. Don't be fooled by the French word! It's frankly… not the best coffee (it's instant), but on the plus side, it's instant. And cheap. I drink it all day long. I don't use a shaker any more, I got an electric mixer, and it literally takes seconds.
Frappé started gaining traction in the '70s, and by the '80s it had replaced turkish coffee (also known locally as greek coffee, or just coffee) as THE standard coffee, at least for young people. Old people don't change habits that easily.
But over the next decades, it lost the throne. We got some new local inventions, this time with Italian names: "freddo espresso" and "freddo cappuccino". (Italians who taste them are typically appalled, though usually they're thrown off by the name and outraged at the price, the coffee itself is alright. Possibly.)
Freddo espresso (or just freddo) is made with a double shot of espresso, which is aggressively iced (pour in a shaker with a bunch of ice cubes and shake aggressively; there are also power tools machines for mixing), and strained in a glass with a straw and even more ice cubes.
Freddo cappuccino is not a real cappuccino (hence all those baffled and outraged Italians). It's a freddo espresso with milk foam on top, where you can optionally sprinkle cinnamon or cocoa powder.
The rationale behind all this is that, unlike the whole point of espresso (drink fast and go go go!), the ideal coffee for greek climate and culture is:
cold: we got an 9-month summer over here, we're not trying to keep warm.
long: it's gotta last. the point is not to chug it, it's to slowly drink it (like turkish coffee is meant to be sipped in the Traditional Coffeeshop™), over like an hour, while you hang out and talk with your friends, or while you work or scroll on your phone or whatever.
quick to make: I'm sure that cold brew coffee is great, but NOBODY here can be arsed to wait a day to have a damn coffee; hardly anyone can be arsed to wait 5 minutes!
(We also got a bunch of hot coffees, mostly Italian ones – real, not fake! But for cold coffee, it's just these three.)
