You Do Need power plug adapter while traveling from Faroe Islands to French Guiana.

Here is Why You Need An Adapter

The outlet and plug type used in French Guiana are C, D and E and in Faroe Islands are C, E, F and K. This is how they look like.

Faroe Islands

In Faroe Islands, outlets of type C, E, F and K are in use.

Type C

Type E

Type F

Type K

French Guiana

In French Guiana, outlets of type C, D and E are in use.

Type C

Type D

Type E