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It's conceivable, though, that they had heard of it (following the accusations against Greta Thunberg of antisemitism, having posted a tweet saying Free Palestine, where she had a toy stuffed octopus next to her), and included the toy mascot on that basis (that is it a toy, not an antisemitic dog whistle, and that being accused of antisemitism on that basis is absurd).
The problem is that even pretend dog whistles can be heard, and that people listening for dog whistles will hear them everywhere.
Out if curiosity what is the alleged trope?