These answers are based specifically on the genetics listed. However, hidden hets are very common so other morphs could also pop up.

Butter Motley x Lavender tessera:

~50% normals het amel, caramel, lavender, motley
~50% tessera het amel, caramel, lavender, motley

Ghost x Tessera:

~50% normals het hypo, anery
~50% tessera het hypo, anery


For a butter motley, I would look for something with the amel, caramel, and stripe genes. For the widest variety of offspring that precludes producing normals, either an amel het caramel stripe, or a caramel het amel stripe. My personal preference would be a caramel stripe het amel. That would test your butter motley for the stripe gene, and produce a nice mix of caramel motleys and butter motleys.

For the ghost, I would probably choose a snow stripe. At the very least you'll end up with anery babies. However, the ghost would work to test the snow motley for hypo, and the snow stripe would test the ghost for amel, motley, and stripe.