"Small potatoes" is an idiomatic expression that refers to something insignificant or of little value. There are many synonyms that can be used in place of this phrase, depending on the context. For example, "trivial," "petty," "insignificant," "unimportant," "inconsequential," and "futile" are all good alternatives. Similarly, you could use words like "insubstantial," "meagre," "paltry," "negligible," or "meaningless" to convey the same idea. In essence, any word that suggests a lack of importance or value could be a suitable synonym for "small potatoes." It all depends on the tone and emphasis you want to convey in your writing or speech.