𝐒𝐨𝐜𝐤·​𝐩𝐮𝐩·​𝐩𝐞𝐭⁣
/ˈ𝘴ɑː𝘬 ˌ𝘱ʌ𝘱.ɪ.𝘵𝘳𝘪/

(n.) An online identity created, and used, for purposes of deception. A sockpuppet purports to be an independent party that supports, approves of, or agrees with some agent (a person, organization, agency, or state), but is in fact created and controlled by that agent, and has no independent existence. Common uses of sockpuppets include plausibly deniable hacking or information operations, provocation, and astroturfing (creation of the illusion of grassroots support).

Source: https://thecyberwire.com/glossary/sockpuppet