Large Claw is the Land Before Time name for Deinonychus. They are the bad guys in The Land Before Time XIX: Hard Water Peak and try and eat Littlefoot, Cera, Ducky, Petrie, Spike, Perrin, Ali, Ruby, the Old One, and others.
The Large Claws in that movie were ultimately killed by an avalanche.
They are a type of Sharptooth. They are called Large Claws by the dinos because of the large size of their claws.
Note: Large Claws were also in a flashback in The Land Before Time VII: The Stone of Cold Fire. These attacked Pterano's herd. In a flashback in The Land Before Time XXIV: The Greatest Adventure Part 2: The Incredible Journey, it is revealed that Petrie's father was among those killed by the Large Claws in Pterano's herd.