In a measuring glass, add the almond milk and coconut milk (no need to stir them together).
In a small saucepan, combine the cocoa powder and arrowroot. Place the saucepan over medium heat and pour in about ½ cup of the milk mixture while whisking constantly. Keep whisking until the milk, cocoa and arrowroot have combined into a paste, then whisk in the rest of the milk.
Let the mixture come to a simmer, whisking occasionally. Let it simmer for 2-3 minutes, whisking occasionally, until the mixture has slightly thickened.
Add the honey, chocolate, vanilla and salt and whisk until completely combined and the chocolate has melted.
Pour the mixture into a large measuring glass and let cool for at least 10-15 minutes.
Give the mixture one last good whisk to blend in any skin that might've formed on the surface. Pour the mixture into popsicle molds and freeze for at least 8 hours. To unmold, you might have to run the molds under hot water for about 5 seconds to release the pops.