There are many synonyms for the phrase "front edges," which typically refers to the forwardmost points or borders of an object or area. Some possible alternatives include "leading edges," "foremost edges," "front flanks," and "front margins." Other similar phrases might include "frontal boundaries," "forward perimeters," and "leading rims." In some cases, it may also be appropriate to describe these edges as "front faces," "front profiles," or even "front fascias." Ultimately, the most appropriate synonym will depend on the specific context and the particular connotations or nuances that a writer hopes to convey.