"feren" as a supposed German descendent of farjaną

Where is it established that it doesn't exist? I don't see a discussion at WT:RFVN.

There's also no discussion at rfvn for sbgzpfnoxmtn, for the same reason: no one has ever created a German entry for it. Perhaps it's an obsolete spelling- it seems like it should have an "h" in it for a modern word. Also, see German Fähre.

I must say that I dare doubt this word too, for my knowledge of German unlike with the other languages has reached a state of completion. And I cannot find usages of it in any spelling on Google Books which I should as Germany has invented printing with movable types. The lexicographic resources I have consulted for New High German and Middle High German lack it strangely too, is this possible for a word from Proto-Germanic? I could imagine it as as a dialectal word at the most. So I find a fêren “rudern” in the Swiss Idioticon the identity of which I cannot insinuate nor deny however. And why is Middle Low German varen in the descendant list when it is from *faraną, identical to the well-known High German fahren? Ghost-word alarm.