Perlin Noise Frequency

I was wondering if there is an easy way to change the frequency for the Mathf.perlin noise function. I figured out how to change the amplitude by multiplying the result.

Mathf.Perlin(x, y) uses (x, y) as the coordinate of the sample point but this does not need to be the same as the world position. If you want to change the frequency then change how close the sample points are to each other by multiplying (or dividing) them by a constant, i.e. Mathf.Perlin(x*2f, y*2f).