Pickerel frog

Thanks for confirmation, folks, but... Can anybody tell me the difference between Pickerel and Leopard???

Easy one, I first sought... Then I stumbled over Pickerel and Leopard frog and now I am no more so sure ;-)... In my eyes it looks like being the Pickerel Frog, Lithobates palustris. But I might be wrong... Please, verify and check some links and pictures I found, I would not dare to make a suggestion... http://www.virginiaherpetologicalsociety.com/amphibians/frogsandtoads/pickerel-frog/Pickerel%20Frog%20(Rana%20palustris)1003.JPG http://www.virginiaherpetologicalsociety.com/amphibians/frogsandtoads/pickerel-frog/Pickerel%20Frog%20(Rana%20palustris)1008.JPG http://www.virginiaherpetologicalsociety.com/amphibians/frogsandtoads/frogs_and_toads_of_virginia.htm https://en.wikipedia.org/wiki/Northern_leopard_frog http://www.frogforum.net/content/leopard-frog-care-rana-pipiens-schreber-1782-r-sphenocephala-1886-131/ http://www.virginiaherpetologicalsociety.com/amphibians/frogsandtoads/pickerel-frog/pickerel_frog.htm http://www.virginiaherpetologicalsociety.com/amphibians/frogsandtoads/pickerel-frog/Lithobates%20palustris%20.jpg