Ok, in your minds, in your little Land Before Time minds, just imagine that you have never seen LBT and/or their sequals before. You don't know the plots, you don't know the characters, and you don't know their voice actors.
Now, that you don't know what LBT is, look around your house/computer files. Look for a LBT movie. Pick ANY movie. I will choose LBT:XI for example.
After selecting your movie, skip to a random scene. How? Close your eyes, and then press the 'foward' and 'backward' buttons on your TV remote or drag your cursor across the movie bar until you land on a random scene. Pause the movie on that scene.
Now examine the scene's characters. I landed on the scene where Topsy and Tria meet eachother and start talking. Now, remember, you don't know their voice actors. You don't know the movie, and you don't remember what you are doing. All you can do is examine the scene given to you and give the characters you see voices.
For me, I just imagined Topsy to have a very Raspy, grumbling voice. Just think of an old man who has asthma walking up a steep hill and then trying to yell out to someone at the bottom of the hill. Yea, that is the type of voice I imagined him with.
As for Tria, I just imagined a very seductive Marylin Monroe type of voice. Nothing else could describe the voice for me

. I just saw Marylin Monroe doing the voice of Tria.
Now it is your turn! Pop out a random movie and turn to a random scene and then, without any knowledge of the movies and characters, give the characters on your scene voices. Trust me, it is very fun.
Now try it yourself! It is very fun to do. Let your imagination run wild!