Sweet
From amg:

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The new lineup of Sweet signed to RCA Records in 1971, where they were placed under the direction of songwriters Nicky Chinn and Mike Chapman. Chinn and Chapman wrote a number of light bubblegum pop songs for the group....Following "Funny Funny," the duo wrote five more Top 40 hits for the group — including "Little Willy" and "Wig-Wam Bam" — which were all lightweight bubblegum numbers loaded with double entendres....

By the summer of 1974, the members of Sweet had grown tired of the control Chinn and Chapman exerted over their career and decided to record without the duo....In the spring of 1975, Sweet had their first self-penned hit with "Fox on the Run," which reached the Top Ten in both the U.K. and the U.S.

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There was also a completely different country song called "Fox on the Run," but I don't know the details.