In Germany, you HAVE to try Crunchips Western Style. It's the best Chip flavour ever. Any normal grocery store should have them.

NicNacs, those breaded peanuts, are also pretty tasty, but not vegan in their normal version. Only the BBQ flavour is vegan, but most stores carry their own store-brand version of them and those usually are vegan (but you have to go by the ingredients list, it seems pretty rare that they use the actual V-Label).

For sweets, Katjes is a super solid brand (I bet they're not exclusive to Germany). My fave from them are their rainbow unicorn gummies:

In my experience germany has way more vegan products in usual supermarkets than france, and they are much better labeled. So stock up there :P

Otherwise in France I think you need to go to the organic shops like SoBio

Where in France will you be staying (if you're ok sharing) ? You can check the HappyCow app to check local vegan restaurants

La Vie is a great french brand that creates simili-pork stuff, ham, bacon, dried sausage, even meatballs