I suggest creating lattice-paths tag for questions related to problems about lattice paths in combinatorics.
Currently some of such questions are tagged integer-lattices+combinatorics, which might be not optimal. (Although formally such question is about a lattice points of some lattice, most frequently two-dimensional, I think that combinatorial problems about lattice paths are different enough to be distinguished by a separate tag.)
Currently there are 50 questions using combination of these two tags. We probably have more questions about this topic. Searching for [combinatorics] lattice is:q returns 241 questions.