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Nouns for calling something we don't know how to call it

My daughter always calls things she does not know how are they called as thingy. She could say just that thing but she wants to express that she doesn't know how are they called and sometimes she just wants to make it sound funny.

Is this expression used in English and are there any other words for calling things we don't know how are they called while expressing that we don't know how are they called to the listeners?