I have searched dict.cc and google-translate. I have even asked my Portuguese friend. But apparently there is no Portuguese word for sparkler.
PS: This is what I mean: https://en.wikipedia.org/wiki/Sparkler
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The name of the object is
This is a decoration mostly used (in Portugal at least) for birthday cakes.
faísca would be
my portuguese friend has done some more research and he came up with the translation "foguete mágico"
The Brazilian Portuguese form for the word sparker varies according to the size (thickness). Cascade Candle for the fine ones and Volcano Candle for the thick ones, however the English term "sparker" is constantly used, depending on the manufacturer.
The literal translation from German wunderkerze into Portuguese would be a miracle candle, but if you use the wunderkerze translator it will result in a sparker and not a Miracle Candle. Logo sparker = vela cascata e vela vulcão.
Vela cascata = Cascade Candle
Vela vulcão = Volcano Candle