Actually, no.
Greenspotteds are sometimes incorrectly called leopards, but the true leopard puffer is true freshwater (while GSPs are brackish.)
Retailers often lable them poorly. Make sure you know what you are getting!
Green Spotted Puffers - tetradon niroviridis Brackish
Leopard Puffers - tetradon schoutedeni Freshwater
They do look very, very alike.