The word "Tossel" is typically spelled with two S's, as opposed to one. The IPA phonetic transcription for "Tossel" is /ˈtɑːsəl/ which breaks down as "tah-suhl". The first syllable "tah" sounds like the "ah" in "father" while the second syllable "suhl" rhymes with "hustle". While there is no inherent reason for the double "S" spelling, it is simply a convention that has been widely adopted in the English language.