Adults taking their children to watch Frozen 2 are set to be bombarded with questions about the environment, as in the film the two heroines battle the elements in order to save humanity and nature.

However, after the film hit screens today, children across the world are also bound to beg their parents for the "must-have" plastic toys associated with the franchise, with some already selling out.

Plastics campaigners have accused Disney of hypocrisy as they "pump out" plastic toys at the same time as jumping on the eco-friendly bandwagon.

Frozen was a cash cow for the company, raking in $1.3 billion at the box office in 2013. However, the merchandise sales dwarfed this figure, with the licensing segment of entertainment and characters accumulating $107.2 billion.

It is no wonder, then, that the number three must-have toy on the annual Toymakers' Association Christmas list is the £39.99 Frozen 2 ‘Into the Unknown’ Elsa Doll, made of plastic. This is sold-out in many stores, including John Lewis.

This is just one of many plastic figurines which have been released to promote the film and are set to be under thousands of Christmas trees this year.