I found these coins in a larger collection of late medieval (XIV-XV century) coins from Northern and Central Europe, mostly Pomerania.
They seem to be struck in rather good silver, weigh about 2 - 3 grams each, with a diameter of about 16 mm.
They look Arabic to me and I was wondering how they made their way to the collection. Was there direct trading between the Baltic and the Arab world in the middle ages? Or did the original collector picked them up on vacation and mixed them with the Pomeranian digups?
Some of these coins have signs of casting, like bubbles and casting seams. Of course, some coins were cast and without knowing exactly what they are, it's impossible to know whether this is normal. However, it is not common and all but the last one look like modern cast fakes to me. But that still doesn't tell you what they're trying to be.
Well, in the third picture I can make out "Muhammad" on one side in Arabic script. That at least points us in the right direction but Arabic script was used to write Turkish and Persian in the 14th/15th centuries as well.
The first two pictures aren't identifiable to me as anything, the best I can make out is what looks like the letter "nun" on the bottom right coin in the first picture.
There are two explanations for this that come to mind. One is that the coin came through direct trade, and the second is that it was done in imitation of the style of Arabic/Persian/Turkish coins.
Here you can see a really interesting example of this when King Offa of Mercia minted a gold coin with the Islamic Shahada around the edges in the 8th century. http://muslimmuseum.org.uk/king-offas-dinar/
For these specific coins I'm afraid I'm not sure though.
Your link appears to be broken.