Clay Rolling Pin, Texture Roller, Sculpting Roller, DnD Terrain Roller.
Texture Rollers are 3D printed in non-toxic PLA.
All plastic rollers work best with soft clays like Das, Miliput, and Apoxie Sculpt. I normally do not recommend these sorts of rollers for foam because it bounces back a bit and I personally like a deeper sculpt-but other crafters seem to like them just fine for foam.
Note: You can use your hand to roll them or use a dowel from the hardware store to help apply pressure.