Why would you object to calling it oat milk? It's simple, descriptive, doesn't deceive anyone. It's not a coincidence that in most (all?) languages coconut milk

Why would you object to calling it oat milk? It's simple, descriptive, doesn't deceive anyone. It's not a coincidence that in most (all?) languages coconut milk is a just coconut + milk in that language. (Using coconut milk as an example since it is a much older product than oat milk)