The sign is a subtle joke. The shop is called "Sneed's Feed & Seed", where "feed" and "seed" both end in the sound "-eed", thus rhyming with the name of the owner, Sneed. The sign says that the shop was "Formerly Chuck's", implying that the two words beginning with "F" and "S" would have ended with "-uck", rhyming with "Chuck". So, when Chuck owned the shop, it would have been called "Chuck's Feeduck and Seeduck".
. This is your kawaii kouhai Aya-chan, calling in from Nihon. I have noticed a severe lack of cute emotes in chat tonight, and instead all I see are baka dansgame and baka nammers. This is not very sugoi, and I would appreciate it if your chat showed more respect for Japanese culture by typing kawaii emotes like