
Anwen Roberts, who owns design company Draenog, said identical versions of her Welsh language products appeared on the Chinese-based site after being copied without permission.
Ms Roberts said it was an added pressure for small businesses like hers in Caernarfon, Gwynedd, when she was trying to make a living.
Temu, which has now taken down the cards from its site, said it acted "quickly" when "potential infringements" were reported, and its goal was to protect brands and artist rights.
Temu, which is owned by the Chinese giant PDD Holdings and was valued earlier this year at $150bn (£117bn), is a marketplace where third-party sellers offer their products directly to customers.
Ms Roberts said it was a "massive shock" to see her work and designs being sold online without her knowledge.
"They were identical and they used the designs we have online," she told Newyddion S4C.
"It just breaks your heart a bit to know someone has used your work, put it out there and is potentially making money from something that I as a small business have created."
Among the cards sold through Temu was nadolig llawen mam a dad - merry Christmas mum and dad in Welsh - featuring two hedgehogs nose to nose while snow falls.
Both the colouring, greeting and designs were the same.
The Temu site card read nadolig llawen mam a dad while Draenog's is mam a dad nadolig llawen.
Another Temu site card showed a large balloon with penblwydd hapus - happy birthday - written on it and tied to a dachshund, which was identical to a Draenog card.
Temu, which sells everything from clothes to electronics and furniture, launched in the US in 2022 and later in the UK and the rest of the world, and ships to about 50 countries."They can just take hundreds of thousands of images, take them off the internet, create some text, do it really quickly and they miss out the bit of weeks and months and hours of working with small businesses like I do and putting a lot of time and energy in," said Ms Roberts.
She said the onus on people like her to report issues was frustrating and time-consuming as there was "also the time of having to track them down and knowing your rights".

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