This one hopped out from under the heather while I was trimming a juniper tree.
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I have seen grass frog used, although mostly in european literature. In th UK common frog is definitely the widely accepted name. To be honest I don't think there is any such thing as a 'correct' english name. In this case both are fine, although most people in the UK use common frog.
Lat/Lng: 50.4, -4.2
OS grid ref: SX5058