I wonder if anyone knows the approximate chance of a jungle temple being generated in a regular-sized jungle biome. Is there a better chance in a giant jungle biome? Are the chances the same across different platforms (PC PS3 Mobile)?
Biome mechanics are not exactly simple.
For best results try a biome mapping utility like Amidst.
The "odds", however, are not stacked in favor of structures being generated. They are meant to add flavor, not to be common.
Edit: to address your platform-dependent question - the many minecraft platform variants are likely using the biome mechanics identically to their version for java. I would suggest you operate under that assumption until it's proven wrong. Also - you will need seeds.