Preheat your oven to 350°F (180°C) and line a baking sheet with parchment paper.
In a bowl, combine the almond flour, coconut flour, and tapioca flour. Add the salt.
Cut in the cold butter until the mixture resembles coarse crumbs.
In another bowl, whisk together the lukewarm heavy cream, erythritol, eggs, and yeast. Let it stand for 5 minutes.
Combine the dry and wet ingredients and mix until a soft dough forms.
Roll the dough out to about 1/8 inch (3 mm) thickness and cut into equal-sized triangles.
Roll up the triangles into croissant shapes and place them on the prepared baking sheet.
Let the croissants rise for 20 minutes to allow them to become lighter before baking.
Bake the croissants for 15-18 minutes, or until golden brown and crispy.
Once cooled, sprinkle with a little erythritol and serve.
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