Finding synonyms for "silly creature" depends on the context of their meaning, but some options include "foolish animal," "ridiculous being," "absurd entity," "humorous critter," or "ludicrous life form." However, using these terms may come across as unprofessional or insulting, depending on the situation. In formal settings, it's important to switch to more appropriate and respectful alternatives such as "eccentric individual" or "quirky being." If you're looking to convey humor or light-heartedness, synonyms such as "goofy pard," "crazy critter," or "wacky organism" may be a better choice. Regardless of the situation, it's important to use appropriate language and consider how your words could be perceived by others.