We don't have synonyms for tortillon yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are tornillo, hortillon and tourbillon.
(n) :
An artist’s tool used to smudge and blend a drawing made from charcoal, pencil, or pastel, consisting of a tightly-wound stick of soft, fibrous paper, sanded to a point at one end like a pencil.
(n) :
An artist’s tool used to smudge and blend a drawing made from charcoal, pencil, or pastel, consisting of a tightly-wound stick of soft, fibrous paper, sanded to a point at one end like a pencil.