Well, not lately, but there were plenty on the road when I was a lad.

I do think the median user would be nonplussed by a name like Mimestream. One struggles to form a mental image of a stream of mimes, and I assure you that knowing that something called MIME exists is uncommon.

The name does tap into the psyche though, thanks to the ancient TV show - and Indigenous tales, of course, though those are probably less widely known.