When talking about acceleration, spoke count isn't as important as mass at the outside of the tire. Or, in other words, weight closer to the center of the wheel (spokes) isn't as harmful as weight near the outside edges (near the rims). So technically speaking, if you have two wheels with different spoke counts, but all other things equal including total weight, the one with more spokes will give you ever so slightly more acceleration. This is because the one with more spokes will necessarily have less weight at the edge.

This is going to make a tiny, itsy bitsy difference in the real world. Without doing the math explicitly, I would expect the difference in accelerations of our hypothetical wheels to be on the order of 0.1%-0.5% at most. Real world wheels with fewer spokes will usually be a bit lighter than those with more, so let's call it an upper limit of 1%.

As everybody else pointed out, proper training (plus gear/cadence selection and reaction time to start accelerating) will make a much, MUCH bigger difference than choosing a wheel based on spoke counts.