What is a puff pastry cake called?

There isn't a specific, universally recognized name for a cake made entirely of puff pastry. However, depending on the fillings and presentation, you might find it referred to as:

* Puff Pastry Tart: This is a common term for a pastry shell filled with sweet or savory fillings.

* Puff Pastry Pie: Similar to a tart, but often with a larger, deeper crust.

* Mille-Feuille: This French term literally translates to "thousand layers," and it refers to a classic pastry made with alternating layers of puff pastry and pastry cream.

* Napoleon: A similar pastry to mille-feuille, but often with a slightly different filling and sometimes topped with a glaze.

* Palmier: These are small, fan-shaped pastries made from puff pastry that are often sprinkled with sugar.

Ultimately, the best way to describe a puff pastry cake depends on its specific ingredients and how it's presented.