No, PayPal is not available in Guinea.
You cannot open a PayPal account in Guinea, nor can you use PayPal to send or receive money.
However, if you have a PayPal account from another country, you can still use it to make online purchases from merchants who accept PayPal.
If you need to receive payments online in Guinea, you might want to consider Skrill or Payoneer, which both support the country.
PayPal has stated that it plans to expand its services to more countries in the future, so PayPal may become available in Guinea in the future.