Lava made of 3D Alphabets

Hi there,
I just want to be pointed in the right direction, but any and all help is welcome.
There’s a request at work to have a lava flow (down a mountain, for example)… only the lava is made of 3D Alphabets.
How would/could I go about doing something like this?
Thank you in advance.
M

You’ll need to clarify / test some effects.

Will the letters be carried in a viscous fluid layer? Visible, or not?
Will they melt into eachother when they intersect or will they bounce / hold their form? A mix of both?