It seems that you're only able to get 1 ( Venomhide Baby Tooth) per day, from the provided daily quest.
This item is part of the quest: http://www.wowdb.com/quests/13906-they-grow-up-so-fast
You need to pick up Silithid Meat (http://www.wowdb.com/items/46380-silithid-meat) and feed it to your Venomhide Hatchling.
It drops from the Silithid's in the southern part of Un'goro, at a 1 to 1 rate.
Very straight forward pick up and deliver quest. Nothing special here.
You need to hit the Ravasaurs to get the poison.
Wield a fishing pole, or similar low-dps weapon to not instant kill them.
Have patience, with this quest. :) GL