I just found "Mandelmich" used on a forum, but the next time the person wrote it, they wrote Mandelmilch, so it looks like the first instance might have been a typo.
On a blog, it's written Mandelmilch every time except once (possibly also a typo?).
In the modern posts, Mandelmich appears to refer to almond milk every time (not marzipan), but often is mixed with Mandelmilch, so I wonder if it's simply spelling errors (spelling on the Web is pretty bad and it's pretty easy to leave out letters).
On a blog, it's written Mandelmilch every time except once (possibly also a typo?).
In the modern posts, Mandelmich appears to refer to almond milk every time (not marzipan), but often is mixed with Mandelmilch, so I wonder if it's simply spelling errors (spelling on the Web is pretty bad and it's pretty easy to leave out letters).