PF

The digraph PF represents the sound /p͡f/, unvoiced labiodental affricate.

Pronunciation
To pronounce the digraph PF, block the air with your bottom lip and your top teeth and push your diaphragm to create an air pressure. Then, release the air and create friction by keeping your bottom lip close to the top teeth. Not less important, keep your vocal chords loose and don't vibrate them.

the sound of the digraph PF is basically the sound of the letter P and then the sound of the letter F, but pronounced in a row.