The etymology of the term hammock is obscure. Dictionaries usually give it as an archaic form of hummock (hammock appeared in print earlier than hummock). Hammock is first attested in English in the 1550s as a nautical term for a tree-covered island (a mound of trees) seen on the horizon.
Lalvin 71B-1122. The 71B-1122 is a red wine yeast, great for cysers and other melomels especially ones using dark fruit like blackberries and cherries. Since it can metabolize maltic acid it produces a rounder, smoother, more aromatic mead that tends to mature more quickly than meads with the other yeasts. Alcohol Tolerance: 14%.
Sugar is what the wine yeast ferments to make alcohol. When the fermentation is done the sugar is gone. When there is not enough sugar for the yeast, there will not be enough alcohol in the wine. Certainly in the case of wild grapes sugar will be in short supply and marginally so with some native wine grapes.