Forgive me, but your cat won't be able to taste the difference.
If it is for people... Especially people who have spent considerable funds for a quality caviar... You are disappointing them at every level.
The eggs are a delicacy... As in “delicate tiny spheres of goodness”
Freezing will burst most, and turn the rest to a vaguely fish-smelling mush.
My advice... Don't do it. Give it to a friend worthy of owing you a big favor.
Sorry.... I'm not guessing on this. Tried it 3 different times.