The phrase "more toughnut" can be difficult to find synonyms for, as it is a relatively uncommon phrase. However, some synonyms for different aspects of the phrase can be used. For example, "more" could be replaced with "increased", "higher", or "augmented". "Toughnut" could be replaced with "difficult", "challenging", or "hard". Combining these synonyms gives us variations such as "increased difficulty", "higher challenge", or "augmented toughness". These phrases can be useful when describing tasks or situations that are particularly difficult or challenging. Overall, while synonyms for "more toughnut" may be limited, there are still multiple options that can convey a similar meaning.