According to Twan Leenders, biologist and author of the Guide to the Amphibians and Reptiles of Costa Rica and some other books on reptiles and amphibians in Costa Rica, this may possibly be Anolis chloris but he is not sure about this.
I met Twan during my visit to the Biological Station Rara Avis (now an Eco Lodge) in the Braulio Carrillo National Park in Costa Rica in 2003 and ever since I sometimes ask his assistance in identifying reptiles and amphibians that I have seen.