sock puppet: a false online identity used for deceptive purposes.  ~ Merriam-Webster

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troll factory: an organization set up in order to publish a large number of messages or posts on the internet, that often appear to be from people who do not really exist, and that are intended to cause trouble, influence political views, etc. ~ Cambridge University Press.

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disinformation: false information deliberately and often covertly spread (as by the planting of rumors) in order to influence public opinion or obscure the truth.  ~ Merriam-Webster

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Russians Again Targeting Americans With Disinformation. ~ New York Times, Updated Sept. 22, 2020.

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Misinformation has been spreading in the nearly two weeks since Russian troops invaded Ukraine. ~ CBS News, Mar 9, 2022.