Mixed nut preparations are generally classified by the component that gives the mixture its essential character, or under the applicable 'other' or 'NESOI' provision if no single nut predominates. However, if the mixture has been roasted, salted, or otherwise prepared, it may fall outside heading 0802 entirely and into the prepared-foods chapters. A binding ruling from CBP is advisable for mixed or processed nut products.

Yes — areca nuts (080280) and kola nuts (080270) each have their own subheadings within 0802. Both are used in traditional and commercial applications distinct from edible snack nuts. Areca nuts in particular may be subject to FDA scrutiny given their use in betel-nut preparations; importers should verify current admissibility guidance with FDA and a licensed customs broker before importing.