Last updated at 15:30
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Pictures: "Cronuts", "duffins" and other cake mash ups

What's in a name? Well a lot when it comes to cake. A new kind of treat called a "cronut" has been been trademarked by its inventor. Here's some other cake combos hitting the shops.
The mix of doughnut and croissant has made it to the UK where they are called a "dosant" or a "crodough".
A tray of croissant doughnuts.
This is the "cronut" a cross between a croissant and a doughnut. The cake was invented by a pastry chef in New York who has trademarked the name.
A "cronut."
French pastry chef Dominique Ansel invented the Cronut in May and it has been a real hit.
Dominique Ansel with a "cronut".
Cronuts are the new pastry craze in New York. People cue up to get a "cronut" at the bakery in New York where is was invented.
People cue up to get a "cronut" at the bakery in New York where they were invented.
What do you call a cross between a doughnut and a muffin? A "duffin" of course. These sweet treats are now being sold in the UK.
A "duffin".
The BBC Breakfast team have got involved and come up with their own cake combo treat, a muffin crossed with a biscuit called a "muffit" Yum!
A tray of "muffets".
And these are called "townies" because they are a mix of a brownie and a tart.
A tray of "townies"