As someone already replied, no you can't use a snack credit on crepes. I still went their twice and paid cash for crepes during our last trip! It was worth it.
Also, if you were thinking of using your snack credits for any cakes/pastries/specialty coffees/etc around the World Showcase... forget about it! You are not allowed to use them for 99% of the items you would expect at EPCOT! This left me particularly peeved, because often the same identical item could be gotten at another park with no problem on the DDP (for example, soft serve ice cream in waffle cone outside France - NOT on the DDP, same thing Animal Kingdom - ON the DDP)!
You will only be allowed snack credits at indoor fast food places for items like iced tea and soda. You will NOT be allowed to buy drinks at the outside "carts" along World Showcase. They all have signs posted saying so.... and to add insult to injury, the majority of them require CASH ONLY. So you can't use your room key card either!
We bought several drinks (20 ounce water and cokes) at outside carts in WS on Saturday using snack credits without a problem. I only saw one cart that didn't take the DDP and that was further up and they sold coffee and pastries; they did have a very clear sign stating they were not accepting it.
We also used snack credits for the cinnamon nuts at a cart in USA.
We didn't try any of the bakeries or anything; too full from all the meals!
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