There are a variety of words that can be used as synonyms for the word "popping." Some examples include "bursting," "exploding," "cracking," "snapping," and "bursting open." Other options include "detonating," "discharging," "igniting," and "booming." Depending on the context, other synonyms might include terms like "emerging," "appearing," or "showing up," which could be used to describe something that suddenly becomes visible or appears in a particular location. Ultimately, the best synonym will depend on the exact meaning that the speaker is trying to convey, as well as the tone or mood they want to create within their speech or writing.