The phrase "greedy pig" is often used to describe someone who is excessively gluttonous or selfish. However, there are several other synonyms that can be used in place of this crude term in order to be more tactful. "Glutton" and "hog" are two common substitutes, while "avaricious swine" or "covetous hog" can be used to provide a more formal tone. Alternatively, one could use metaphors, such as "bottomless pit" or "black hole," or simply refer to the person's insatiable appetite or selfish behavior. Whatever term is chosen, replacing "greedy pig" with a more appropriate synonym can help to communicate the same idea while maintaining a higher level of professionalism.