Ο ελέφαντας is a masculine noun ending in -ας. These nouns have a specific way of declension.
ο ελέφαντας (sing., nom.) - οι ελέφαντες (plur., nom)
του ελέφαντα (sing., gen.) - των ελεφάντων (plur., gen.)
τον ελέφαντα (sing., acc.) - τους ελέφαντες (plur., acc.)
Nouns like άντρας, χάρακας, έλικας etc have a similar declension pattern. ^.^
"F" instead of "ph" in "elephant" should be considered a typo, not a wrong word
If you have a physical keyboard, try pressing the key next to the L (where the semicolon is on a US keyboard), then pressing the vowel key.
If you have an onscreen keyboard, try long-pressing the vowel key.