The honest answer to that question is no...not many. Though, there are a few notable exceptions. The biggest challenge that renter's agents face is that few people who have a property to rent want to list with an agent or work with an agent and pay a commission - Not to mention the fact that most commissions paid to agents for finding rental properties are very small and require the same amount of work as assisting buyers. This makes for a very slim market of rentals for agents to access and assist renters in their search.
There are agents out there who are both skilled and willing to work with renters, but the majority of agents build their businesses around listing and selling property. I would recommend calling real estate offices and asking for agents that specialize in the area of renting rather than locating a property first and then following up with an agent. Best of luck!