You should say chocolate croissants. Croissants with chocolate in them, but not necessarily croissants. Croissants are also common. Others, like croissants, use pastry, which is what we call pastry.

There is something wrong with Xu Peng 2020. In French, pain refers to bread. Even if you want to say chocolate bread, you should say chocolate de pain.

Here is the link to the picture, so you can see what it looks like:

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