Yep, looks like a mint to me. The only way to tell for sure is to........(drum roll...) Tear a sprig off and stick it in a mojito...then crush more up and put it in the drink...then drink it! If it tastes good and cool and your head feels good its probably some kinda mint..If it makes you sick, you've probably ingested poison ivy!
just kidding, dont take me serious......The mojito will make you feel good without the mint anyways!
Your friend,
john