You Do Need power plug adapter while traveling from American Samoa 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 American Samoa are A, B, F and I. This is how they look like.

American Samoa

In American Samoa, outlets of type A, B, F and I are in use.

Type A

Type B

Type F

Type I

French Guiana

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

Type C

Type D

Type E