Not while the war was on. They didn't have enough transport to spare.
In The Memoirs of Prince Max of Baden, it is mentioned that a substantial quantity of grain has been collected "and is starting to rot" because it can't be moved. They collected more than enough to feed their troops in Russia, but getting it to Germany was another kettle of fish.
This was also a major factor in the absence of cavalry during the 1918 offensives. All the horses were needed for transport.
Had Germany, in spite of this, managed to win those offensives, and France had fallen, the situation would have radically changed. The locomotives and rolling stock used to take men and supplies to the Front would have become available for other purposes, and food could have been transported, but Germany had to win that battle first.