Wikipedia calls tacos a common form of antojitos, the Mexican street-food category.
The Spanish word antojitos literally means “little cravings.” In Mexican food culture, it describes a broad family of informal foods commonly prepared by street vendors, market stalls, and small traditional eateries. Tacos belong to this category alongside tamales, gorditas, quesadillas, tostadas, chalupas, elote, pambazos, and many regional specialties.
Antojitos are often associated with corn-based foods and are typically eaten outside the main formal meal of the day. They may be served in the morning, evening, or late at night, when taquerías and market stalls become important gathering places. The category is cultural and culinary rather than a single recipe or cooking technique.
Mariscos means seafood, guisados means stews or cooked dishes, and botanas generally refers to snacks or small savory bites. Those terms can describe particular foods or serving styles, but they are not the canonical category Wikipedia uses for tacos. “Antojitos” is therefore the precise answer.