You might want to have a look at these two previous threads, amongst others.
featuring /u/BigglesGoesOnReddit
and https://www.reddit.com/r/AskHistorians/comments/8bwnx7/on_the_surface_soviet_deep_operations_and_german/ with myself.
I guess I would amend my response a little bit for the second one: The British were not the first to actually use the word "Blitzkrieg", it did show up in very occasional German writings before the war, but it was used more as a concept for a war than as a doctrine for operations. The British press then took the word and mis-applied it.
If you can find it, " Storm of Steel: The Development of Armor Doctrine in Germany and the Soviet Union 1919-1939" will give you a thorough answer to your question.