My 7 week old had rsv last week and was in the hospital for 6 days he has been home for 5 days now and still has thick green bugers is this ok he has?

No problem: These will eventually recede as the inflammation changes all resolve.

Yes: The runny nose and congestion with RSV will typically take some time to resolve. And the color of the snot is not an indication of other problems - just that it is getting thicker. Continue with frequent saline drops in their nostrils, and if you have further concerns, see his doctor for a follow up.