Pour the Tazo chai tea concentrate into a glass. Add oat milk and stir well to combine. Fill the glass with ice.
In a separate bowl, mix together the pumpkin puree, heavy cream, vanilla extract, and pumpkin spice. Use a frother or whisk to blend until the mixture becomes thick and frothy.
Pour the pumpkin cold foam over the chai tea base. You can gently stir it in if desired or enjoy it layered for a beautiful presentation.