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skeleton gelatin
Skeleton's Gelatin.
it solidfy by the temperature
milk
Yes, the dessert Gelatin is a type of colloid. It is a colloid because it can be easily made by adding powder to water so that it congeals.
The mixture is homogeneous.
See: Gelatin Dessert
Pigs trotter is boiled and put into gelatin
Neither - it a colloid of a liquid in a solid.
bananas, canned fruit
Jello is a flavored gelatin dessert. There are also recipes that use Jello to make molded gelatin salads (but these have mostly fallen out of use since the 1960s, except for molded gelatin fruit salads). Gelatin is the main ingredient in Jello, and the reason it sets up.
Peter Cooper patented powdered gelatin in 1845, but it was turned into a fruit-flavored dessert and trademarked by Pearle and May Wait in 1897, who named it Jell-O. It became super popular in 1904 when the company they sold the trademark to started handing out free Jell-O cookbooks.