Ciao Toni, buona Pasqua Nice question for a rainy day!
AFAIK most of the data on Bookwyrm is about English books, but other languages are hosted as well. Not everything being published in Italian is there, I sometimes add books published in the early 2000s that I borrow from libraries, and that nobody has uploaded on Bookwyrm so far.
So, I searched for some German books from my account, and I was able to find them.
I looked for authors and titles that Amazon.de mentions as a 2024 blockbuster; if books are hosted somewhere in the Fediverse, then they can be found. Most german books I found actually are on Openlibrary.org, not necessarily on a .de website.
For example this book, currently No11 on Amazon.de,
https://www.amazon.de/-/en/Stefanie-Stahl/dp/3424631078/ref=zg_bs_g_books_d_sccl_11/262-2530665-3651032?psc=1
is here:
https://openlibrary.org/works/OL23983500W/Das_Kind_in_dir_muss_Heimat_finden
I do not know if the second link is visible without a Bookwyrm account, I guess so, since a friend of mine can see “my books” without a bookwyrm account (not even from Mastodon, just by following a link to my profile).
So (probably) you can search and find on openlibrary.org, that looks quite a big search engine about books, whatever in German seems to be there, by inserting German titles or German authors (not by selecting a language, AFAIK).
Without a profile you cannot post what books you have read, comment on other people’s books, but you can (probably) see quite a lot of what is already there. The idea is: from a Mastodon account, you’ll follow someone on some Bookwyrm instance that is tooting about books you normally like (a publisher, an expert, just another reader…) so you get a toot when this person reads, comments etc. on your Mastodon Home feed, and then you may take these suggestions on a book to buy/borrow/read yourself.
Buona Pasquetta (weather forecasts are even worse for tomorrow)
gabriella