How soon can protein bars be started? Can protein shakes be frozen & eaten?

I'm one week postop (open rny) and those protein shakes and I are just not the best of friends. I've have used crysal light and ice in them which helps, but can I completely freeze them and eat them with a spoon without effecting the protein? When can I start protein bars-my doctor's diet doesn't say? Are they not as nutritionally sound as the shakes?

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