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Doujin are mangas but created/drawn by fans. So I guess you can say whitelabel manga, but they use popular IPs and sell them to showcase their skills.

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ahh I thought doujin manga are the boy love ones or something 🤣

Lol no, doujinhi means

Doujinshi (同人誌), also romanized as dōjinshi, is the Japanese term for self-published print works, such as magazines, manga, and novels. Part of a wider category of doujin (self-published) works, doujinshi are often derivative of existing works and created by amateurs, though some professional artists participate in order to publish material outside the regular industry.
- Wikipedia