The Land Before Time VIII: The Big Freeze

The Land Before Time VIII The Big Freeze is a 2001 directtovideo animated adventure musical film and the eighth film in The Land Before Time series.

Meanwhile, as Ducky gives Spike the cold shoulder, Spike meets and befriends a young dinosaur from a wandering Spiketail herd, who have recently arrived in the Great Valley. Ducky begins to miss Spike, as she watches him spend more and more time with this herd of his own species. One day, however, the entire Valley is surprised by an overnight snowfall which the characters refer to as either white sky sparkles or white ground sparkles. While the children together have fun frolicking in the snow, the adults complain that Mr. Thicknose did not warn them about this sort of thing happening in the Valley, and suspect that he does not know as much as he claims.As time wears on, the dinosaurs begin to notice the more horrific side to snowfall the freezing temperatures and the lack of food growth. The spiketail herd offers to leave, as they consume more food than most species. The mother of Spikes new friend, Tippy, asks Mama Swimmer if she can take Spike along during the cold time, and Mama Swimmer decides that Spike should choose between staying in the valley, or leaving with them. Spike is unsure, so Ducky frustratedly tells him to go off. As he leaves, she immediately regrets her actions, and later sneaks away to follow the spiketail herd. When her friends find this out, they head off into the Mysterious Beyond to find her, but are interrupted by Mr. Thicknose, who tells them he will not let them go off there by themselves, and leaves with them. After several rough scrapes, including a chase from a mountain sharptooth, and successfully finding Ducky, they come across a frozen pool of water, which they break by accident. Underneath the ice is warm water, and they notice that there is lush food nearby. While they relax in the water and feed, Mr. Thicknose confesses that most of his knowledge comes from secondary sources he listened to the stories of the grownup travelers when he was a child, and in his adult years, he told those stories to the children in the valley. ...

Source: Wikipedia