(The DM can force you to use this feature at opportune times, like when you see a slab of raw meat or a fresh corpse.)

Make a WIS saving throw. On a fail, You gain 5 temporary HP and any CON or STR based rolls gain +2 for 3 rounds. In addition, if the DM forced you to take this action, they can choose to temporarily take control of your character, making them go feral until the feature ends. The effects of this can include, but are not limited to:

d10

1 -Running off with a shiny object (or any object seemingly useful or of value if nothing visible is shiny)
2 -Lashing out at the nearest creature
3 -Screaming nonsense in Primordial
5 -Circling a party member and cackling wildly while baring your teeth menacingly
6 -Attacking the closest creature
7 -Circling around the party slowly, assessing them (you can roll again on each of your turns to see what you do next)
8 -Dropping all your gear and attacking hostile creatures with just your natural weapon(s)
9-10 -Nothing, the effect ends

Every FossilBorn has something that relates them to the specific breed of dinosaur they are descendants of.

You can do chomps.

You can speak Common and one other language of your choice.

You are proficient in Animal Handling, Survival, and Intimidation.

Your STR and CON scores increase by 2 and your WIS score decreases by 1