Can you ron with these hands?
Generally yes, but it will depend on which variant you are playing and any special rules. It sounds like you are playing Japanese Mahjong (since you use the term "ron"), in which case you will need to be sure your hand has at least one yaku if you use someone else's tile to win, and obviously you can't be in a "no ten" state.

Precedence rules may also apply if two players are trying to simultaneously win off of the same discard.