I'd imagine a kobold could kill and eat any thing's offspring. Even a dragons. That strategy isn't so much parasitic its more sinister and evil. Survival at all costs.
That's how coyotes survived for so long. Feeding on the youngsters of other things. Scavenging. But also murdering larger beasts when they were young. Taunting with nibbles, until that youngster got far enough from its parent to suffocate with one well placed bite to the windpipe. Game over. Suffocation favors the small. If you have my throat and I have yours, the one of us who can still squeeze and stay conscious long enough lives. That is the smaller more oxygen economical one. The larger one has to use more o2, to fuel its larger muscles and organs, just to stay conscious.
This is how coyotes coexisted for a dozen million years with wolves. Its small frame, and sufficient bite, made it more lethal in 1v1. Its interesting to note, that all apex predators have more than one weapon to rely upon. Even the venomous ones. A kobold could have its stealth, AND its cunning. Hard to say. But in survival, there is nothing gained from overkill, but the attention of other killers. Size is a penalty, outside the porn industry.
What was I smoking when I wrote this? LOL!
Sincerely,
Knutor