There's no single definitive spelling of "Love Pooh," as it's a playful phrase rather than a proper noun with a standardized spelling. However, the most common and natural-sounding spellings are:
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Love Pooh: This is the simplest and most straightforward option, mirroring the spoken phrase.
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Love, Pooh: This version adds a comma to subtly separate "Love" and "Pooh," suggesting a more affectionate or sentimental tone.
The best choice depends on the context. If you're writing a casual note, "Love Pooh" might suffice. For something more formal or heartfelt, "Love, Pooh" might be more appropriate.