The word frangipani has 4 syllables.
Fran as in Frank
Jee as in Jeep
Pan as in Frying Pan
Knee or Ni as in Nickle
The syllables Fran and Pan are pronounced very differently depending on country and accent however they should have a similar pronunciation and should rhyme.
The word frangipani is sometimes shortened to just frangi. This is pronounced frang-jee and the plural form is spelt frangis and pronounced fran-jees.