Adding my 2 cents here to this little linguistics discussion; while it might not be the correct term for the sword form itself, it's worth noting that the "puttah" in "mel puttah bemoh" is likely a phonetic spelling of the hindi/sanskrit word "patta", or long straight leaf blade (leaf blade as in a plain blade of grass, not the more curvaceous tree leaf shape more commonly thought of for swords). Indeed, this is the same term that is also used to refer to the more common gauntlet sword, as, like the MPB, its overall profile is relatively uniform, symmetrical, and straight (like a blade of grass is). This word, though I could be mistaken, is also likely the root of the "pattani" in "pattani jamdadu", an old and probably just as dubious term used to refer to (mostly south indian) katars that have long, straight blades.
Of course what "mel" and "bemoh" likely mean is all up in the air for me
. While it's possible that for "bemoh", like with "puttah", the open vowel at the end of the word has been transliterated with an extra h to indicate aspiration/emphasis (making the third word "bemo"), there's no real reason as to why this would have to be the case.
Use-wise, I'd have to imagine they'd be used as some sort of spear/sword hybrid. That is to say with the handle likely gripped in spear fashion, but, as with most indian weapons, probably used to cut with more than thrust, especially with such a long blade.