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I found a few of these Barbarossa tokens in the back garden - similar to those depicted here.
BARBAROSSA - CORSAIR KING OF ALGIERS SCOURGE OF MEDITERRANEAN AS PIRATE AND ADMIRAL OF THE TURKISH FLEET FROM 1536
It's aluminium and just feels to me that it might be part of a treasure chest piece on a board game, or a tacky souvenir from a Turkish tourist trap!
As you indicated in the question, there are existing tokens (i.e. coins, possibly as a souvenir) that bears the exact same inscription in your question.
Two commenters have already indicated that the token does not appear to be part of a board game. Given the similarity to non-board game tokens and the fact that nobody has been able to identify it as part of a board game in over a year, I'm inclined to say that this is not a board game piece.
The token you have found is not from a board game, but is rather a promotional token minted as part of a 4 coin series for Sugar Puffs in 1967.
Barbarossa is the most common of the tokens, but considering one of the tag lines was "Stash away your own pirate treasure" it makes sense a child might bury their treasure.
