The question speaks for its self
The only one is the spirit of the ancient golem, built out of the spirit stone
it gives 7 mana regen per 5 sec 30 armor
I like and use this item for tank junglers
but it is not viable in lane and other than that there are no items with mana regen and armor

probably because mana regeneration is one of the most depressing stats to get on items it doesn't have any synergy with, mana regeneration is a problem that can be entirely solved by either chalice or tear upgrade, and armor is extremely easy to grab in very large quantities on dedicated armor/defensive items.

the selection of hybridized stat items for counter-building physical damage is pretty bad though, but for all intents and purposes mana accomplishes exactly the same thing as mana regeneration - and there are some pretty solid armor + mana items.