Ovie sounds a bit too lazy for me.
for me, "Ovie" it sounds more sweet, cute and fitting.

:
I think Littlefoot and Ducky names are epitome of cuteness, so I like them very much. Thunderfoot are more... mean. (Крожки-Ножки... YEs. Great!)
Cera and Petrie sound normal.
Spike and Bambo sound strong.
Chomper (Зубастик! ^^) sounds... cute and little weird at the same time. XD