well, no. wine is made from fruit, mostly grapes- as above.
otherwise its a beer if its grain based.
Wybroka was the vodka that was trendy for a few years, distilled through bison grass to give flavour (like gin with the botanicals and juniper). But it was still a grain alcohol.
I guess you could grow some wheat grass, juice it and try and ferment it.
The wheat grass will have zero sugar content - leaves are not large carbohydrate storage compartments like grains, roots (potatos etc) or fruit.
Mostly they are cellulose which is there to provide structure - and I guess if you could malt that somehow it would extract some sugar.
Either way I reckon the reality of fermenting wheat grass juice is you would end up with less fermentable sugars than normally added to provide carbonation.
I genuinely can't wait to see your OG and FG numbers - it would be interesting to see what is actually fermentable in grass clippings.
Chris