Yes! It’s called the flea comb, and requires thorough, patient use at least once daily.
Forget “natural”. That term has no legal definition, and so-called natural products are often far LESS safe for your pet than effective products that are tested for both safety and efficacy by the EPA (over-the-counter topicals like FrontLine or Advantage) or FDA (prescription drugs like Bravecto, Simparica, Credelio).