No kill tracker that I’ve seen.
Ekun gets maybe 1/2 the kills for my whole group combined. My MC is a druid, so his buffed pet is a distant number 2 within my group with Valarie as #3. My MC without pet gets a few kills, but nothing compared to Ekun.
I did just get Nok Nok, so maybe he will move to #2 on the kill list for my group.