[moehm]

Actually (green) tea leaves have more caffeine per gram than coffee beans do, but in general you use more coffee (~60 g/l) for your cup than tea leaves (~12 g/l) and hotter water, so more caffeine is released.

However, tea leaves are safe for consumption, so you could eat them instead (for example as a salad).

[volkl48]

Or for likely the most common form - Matcha, which is green tea leaves ground to a powder.

[packetlost]

Matcha is not terribly common in the US. You can find it, but you have to go out of your way to