The phrase "grotesque figure" can be replaced with several synonyms that convey a similar meaning. The term "monstrous creature" can be used to describe an unusual or frightening figure. Another option is "freakish being," which implies a sense of abnormality or deformity. "Aberrant entity" is a more formal phrase that suggests a departure from the norm. "Distorted shape" is a descriptive alternative that emphasizes the unusual appearance of the figure, while "macabre figure" or "nightmarish form" convey a sense of horror or dread. Choosing a synonym for "grotesque figure" depends on the context and desired tone, but these alternatives offer a range of options.