Bugger. Not even if mixed into hardtack? :V
Not even. They would reduce the shelf life to somewhere in the region of "not very long."
Butbutbut. This royally screws up an idea I had. D:
Granted, it still seems perfectly sensible if you want something that has more nutrition than hardtack alone. Question is whether it'll at least last longer than fresh, proper bread and cooked lentils would separately...