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Pictures would help to confirm this, but Polish x Sussex would give you a single comb from the Sussex with a partial splitting from heterozygous duplex V-comb gene from the Polish. That could be somewhat reminiscent of the OP's bird's comb. It's possible that's what you're seeing in your birds. 🙂

Yeah, that's a heterozygous pea comb, otherwise known as a modified pea comb. The gene is partially dominant over single combs, so birds that are pure for the gene get the three-rowed combs that are shorter and closer to the head, but those not pure for it get something that looks somewhat in...