Tiny vines growing from leaves.

[Built2Prfctn]

Is this normal? Never seen this before on my plants.

 

[Demeter32]

Just from the title I just knew you were talking about a java fern. It's how they create more plants, old leaves will grow little plants from the nodes on the underside. If you see a lot of them doing it then it may be a sign of stress, the plants look ok to me though.