You Do Need power plug adapter while traveling from Eritrea to Tokelau.

Here is Why You Need An Adapter

The outlet and plug type used in Tokelau is I and in Eritrea are C and L. This is how they look like.

Eritrea

In Eritrea, outlets of type C and L are in use.

Type C

Type L

Tokelau

In Tokelau, outlets of type I are in use.

Type I