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Actually, I think that there is one that probably qualifies for that title.
RTB (Return To Basics) has been specifically crafted for the Raspberry Pi in so far as it has awareness of things like the Pi's GPIO pins.
Available here:-
https://projects.drogon.net/rtb/
This is not BASIC in Flash/ROM but a Linux executable program.
The Raspberry Pi Foundation of course promotes "Python" as the officially preferred language.
I've not really kept track of all the details here myself. At one point the FUZE
http://www.fuze.co.uk/
was being offered in a version containing the Colour Maximite. Not sure if it was a hybrid with a Raspberry Pi in the same case as well(?).
Today they seem to be offering only versions (that I can see) with a Raspberry Pi installed and it comes with FUZE BASIC. FUZE BASIC appears to be a commercial spin-off of RTB as mentioned above. With some added extensions for things like controlling popular robotic arm kits.
Just recently the developer of RTB (and FUZE BASIC one assumes) Gordon Henderson, back ported some of the FUZE BASIC enhancements into the Open Source RTB package. So right now if you launch the RTB full screen editor it declares itself as being FUZE BASIC. An over-sight no doubt. But the two products are not exactly equal. The robotic arm stuff is missing from RTB for instance.
Superficially at least RTB is very similar to Geoff's MMBasic. But MMBasic likely has a lot more depth to it (I have only played with RTB superficially). The target audience for RTB is clearly Education while increasingly MMBasic leans towards Embedded solutions. Which is not to say the CMM wouldn't make an excellent classroom tool.
Anyway, if you have a Raspberry Pi and wish to play around with BASIC I can recommend RTB.
I also ported the DOS version of MMBasic to Linux a while back (MMBasic 4.4):-
Console text version only. No graphics, No sound, No attempt to emulate Maximite hardware. But I never got around to re-compiling it for an ARM chip version of Linux aka the Raspberry Pi. Guess I should probably get around to doing something about that. And update to version 4.5 at the same time...