You Do Need power plug adapter while traveling from Cameroon to Azores.

Here is Why You Need An Adapter

The outlet and plug type used in Azores are B, C and F and in Cameroon are C and E. This is how they look like.

Cameroon

In Cameroon, outlets of type C and E are in use.

Type C

Type E

Azores

In Azores, outlets of type B, C and F are in use.

Type B

Type C

Type F