An interesting and very original idea.
One idea could be similar to where oc herd that 2 of my oc deinonychus fast biters belong to, a large lake area just outside the great valley with lots of fish in it. Though you may want some changes that fit into your rp idea better, farther away from the Great Valley, not a large lake, larger then a lake, ect.
Also do you want to try for some sharptooth equivalents to the gang? At least a 4 footer or 2, a small 2 footer, a flying sharptooth, though I guess having one that doesn't talk may not be one thing you'd be shooting for.
Also have you decided on if it'll be pure lbt, so no powers, no fastbiters able to run at speed of sound, Chomper able to breath fire, summon lighting, shapeshift or the like? Or if some powers will be allowed?