The word "plodge" is not very commonly used in English, and it may be difficult to find synonyms for it. However, there are a few words that could be used to convey a similar meaning. One possible synonym is "wade," which means to walk through water or a soft, wet substance. Another synonym could be "slog," which means to move through something with great effort and difficulty, often because it is muddy or sticky. Other words that could be used as synonyms for "plodge" include "trudge," "wallow," and "tramp through".