What are those chewy cubes found in mango pudding?

Factual Questions
1

It sure as hell isn’t mango.

2

It could be konjac/konnyaku. It’s a vegetable-derived gel, usually clear when you find it in desserts–sort of like a harder, chewier, more slippery version of gelatin.

3

It could possibly be dried mango. Like but not entirely the same as actual mango, it’s chewy and kinda weird.

Define pudding, too. Are you talking about a steamed/cake style pudding, or the american style custard-“pudding”?

4

Could be tapioca.