Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
frondātor, ōris, m. [1. frons], one who strips off leaves, a leaf-stripper, a dresser, pruner of trees, etc., Verg. E. 1, 57; Ov. M. 14, 649; Plin. 18, 31, 74, § 314.