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Russian fighter jet downed over eastern Ukraine as oil depot set ablaze
(www.independent.co.uk)
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They are not call signs, they are reporting names. Russians don't call it the Frogfoot, it's a name NATO uses to talk about it that's easier to remember than numbers. All fighters start with F, bombers with B, helis with H and if I remember correctly, air to air missiles with A.
The actual nickname the Russians have for the Su-25 is Grach, meaning Rook.