The phrase "did he though" can be replaced with several different synonyms depending on the context and tone of the conversation. Some alternatives include "did he really," "seriously," "honestly," or "truly." These phrases can be used to express doubt or disbelief in someone's statement or to encourage further clarification. In some cases, "did he though" can even be replaced with a simple "yes" or "no" to provide a direct answer to a question. Ultimately, the best synonym to use will depend on the specific conversation and the speaker's intended emphasis.