I would say that there's another more common that is a good fit. consultante (que consulta [one who asks]), which appears almost 10 times more frequently than preguntante (6559 vs 730) when checked at the same source Hemeroteca Digital
Here is the RAE's definition of this (latin) verb:
Del lat. consultāre, intens. de consulĕre 'considerar', 'deliberar'.
tr. Examinar, tratar un asunto con una o varias personas.
tr. Buscar documentación o datos sobre algún asunto o materia.
tr. Pedir parecer, dictamen o consejo a alguien.