sandbagger

The English word “sandbagger” has 2 meanings listed here.

noun

One who sandbags (misleads about their ability level in order to win bets); a hustler.
A robber who sandbags (suddenly strikes, with a sandbag or other object, so as to stun) victims.

From sandbag + -er.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.