The short answer is no.
The PWM (Pulse Width Modulation) refresh rate for all pixel ICs is part of the chip’s design and, therefore, cannot be altered (it’s part of each LED chip design).
If intending to film your LED pixel strip or install it in a TV studio, it’s worth looking at specifying an IC with a high PWM rate to reduce the chance of flicker on camera. Pixel ICs come in varieties that typically vary from 400Hz to 1200Hz.
A list of pixel ICs compatible with ENTTEC products can be found here.