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What is frozen on them? I assume it is the seacock attached to the thru-hull. A Thru-hull is technically just an piece with a hole in it that passes through the hull and has no parts to freeze or tighten up. A penetrating oil might help, if they're just stuck from disuse, however, they may be corroded in place or be frozen due to mineral deposits or sea growth.
If it is the seacock attached to the through hull, it would help to know what kind of seacock it is. Are they bronze or plastic? Are they gate, tapered cone, or ball valves?
It sounds like they were not properly maintained, and have seized up. If that is the case, they may in fact be corroded badly enough that your only option is replacement.
If you do need to replace them, I would go with a high-quality marine bronze ball-type valve seacock. Your other choice is a ball-type valve Marelon seacock, which may make a lot of sense, especially in the case of a metal hulled boat, where galvanic corrosion is an issue.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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