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"Grass Frog" is an accepted alternative to "Common Frog" as a common name, see, e.g. http://www.bbc.co.uk/nature/wildfacts/factfiles/483.shtml
Consequently the common name has not needed to be corrected, though "Grass Frog" might better be termed an uncommon name.
Grass frog is the old name for this species and I used it as it is more descriptive and less parochial than "common" frog.
As English names are not stadardized and the scientific name is correct the originak id does not need to be corrected, although as a naturalist I am far more interested in sharing a sign that spring is on the way than scoring points.
I agree that grass frog is an acceptable common name and doesn't need correcting. However, it isn't quite as precise as common frog as (in Europe) it can refer to other frogs in the genus Rana such as the agile frog, moor frog and others.
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