Yes, the PolygonManager allows you to set a polygons texture and that includes uv...this works only if the object hasn't been stripped and if it has been build by calling build(false);. After modifying the coordinates, touch() has to be called on the object to promote the changes. However, updating uv isn't particularly fast. You might want to consider to use a texture matrix instead...that might not work on some older phones (like G1), but if you target newer devices only, that doesn't matter.