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What are these forms: かけちゃお, つないじゃお?

I'm trying to understand the lyrics of a closing song of 「崖の上のポニョ」. First verse is simple, but the second stopped me: ペタペタ　ピョーンピョン 足っていいな　かけちゃお ニギニギ　ブンブン お手てはいいな　つないじゃお What happened to arms and ...