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"Modified pea comb" is usually used for birds that are P/p r/r (one copy of the pea comb gene, no rose comb gene). They have a pea comb (as in, not single, not rose, not walnut), but it is often big and odd-shaped, rather than the tidy pea comb found in P/P chickens, that is expected in any of...

Right except: any of the rose comb breeds has a chance of carrying the not-rose gene, so they sometimes do produce chicks with single combs. Yes, pea + rose is walnut, if the chick actually inherits those genes from the parents. But if the parents show pea or rose comb, they might not actually...