The song Foxy Samba has two chords, the C chord and the F chord. As there is a C note in both the F and C fingered chords, you can keep your second finger on the C note when you change between them. This will make changing chords very easy.
Try this chord progression with a samba rhythm.
This song contains all three chords you have learned so far. Remember to keep your second finger down when changing between C and F, and your fifth finger down when changing between C and G.