Not readily. You can go through his games to see how long each game lasted and how many moves were made, but that's a tedious exercise. If he plays a lot of 1/0 games it's a fair bet that he moves often.
Originally posted by Steve45 Have a look at their moves per month. That will give you a good idea.
This is probably the best way. In case you don't know where that is, go to the top of the page toward the right side and click the 'tables' link, then look over the 'most active players' table.
If you are concerned about move frequency, set the game parameters low. I never want to time out so I always play the ones with the least time remaining first.