The best alternatives to Mr. Parrot are Twitter, Discord, and Party Parrots. If these 3 options don't work for you, we've listed a few more alternatives below.
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Inspired by the classic Party Parrot emoji, Party-ify lets you automatically create GIFs in the same vein. Tweak the size, style and colour of the partyification, and generate custom emoji that I hope will help bring some fun to your favourite Slack and Discord chats!