Almond cream is just almond meal, butter, sugar and egg whereas frangipane has all those ingredients as well as pastry cream. Some cooks use the terms interchangeably and that's usually okay. They can be used in a lot of the same recipes and give similar results and flavor. The main difference is that frangipane is lighter and says pretty wet when cooked. Almond cream firms up when cooked and has a denser texture.