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Killer dolls inspired by the smash-hit Disney film Frozen could be circulating in the UK, consumer watchdogs have warned.

Trading standards bosses said fake singing Anna, Elsa and Olaf the snowman toys potentially contained chemicals linked to cancer, birth defects and infertility in men.

Walsall Council said it was investigating reports the Chinese-made products were being sold on a market stall and Facebook, reports the Birmingham Mail.

Cabinet member Coun Khizar Hussain said: “It is pretty much impossible to tell these dolls are counterfeit just by looking at them but they are potentially very dangerous.

“I would urge anyone who thinks they may have one to keep them away from children and to get in touch with trading standards for advice.”

Watch: Dad gets his daughter a frozen doll for Christmas...literally

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Hundreds of fake Frozen dolls destined for the UK were seized by border police in November.

The rip-off toys, complete with fake Disney packaging, were discovered when officers at the port of Dover raided a cargo ship arriving from China.

Alongside the 426 Frozen dolls officers found 1,400 fake Peppa Pig toys which were leaking an unidentified chemical.

Frozen’s Snow Glow Elsa was the most in-demand toy in the Christmas rush, topping festive want lists for girls and toppling Barbie which had held the title for 11 years.

Stores struggled to keep up with demand for the interactive doll, which sings, speaks and lights up and was priced at £34.99.

Many household chains and websites, such as Tesco, Toys r Us and Argos, listed it as being ‘unavailable’ in the run up to Christmas, while new stock was snapped up as soon as it arrived on shelves.

Demand was so high that eBay entrepreneurs were cashing in by charging as much as £149.99 - a mark-up of almost 160%.

Earlier this year, Frozen became the fifth highest-grossing film in box office history.

The Oscar-winning movie, which was released in the US in November last year, has taken more than £723 million worldwide – making it the highest-grossing animation in history.

The movie's soundtrack has sold more than a million copies and been streamed more than eight million times on Spotify.

It has also sparked a string of copycat videos on YouTube of children singing with their parents.