It's certainly possible and grammatical.
"Emerge from the pack" is a slightly incongruous metaphor here, perhaps: when you "emerge from the pack", you are very much the active party (the metaphor is from e.g. wolves); but in the case of the fruit, they are acted upon, by the process of the poll.
So I would simplify it a little:
"In an online poll, strawberries have emerged as Taiwan's top classic fruit."
(Here, "emerge" has lost its active force.)
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