Yes. Depending on the size of the sweater and the weight of yarn used, a knitted sweater may use up to 1000 or 2000 yards of yarn. The average ball of worsted weight yarn contains about 200 or less yards, so it is not only possible, but necessary to knit a sweater with more than one ball of yarn.
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I knit a scarf for my sister.
The cast of How to Knit a Sweater - 2012 includes: Ember Fulson
If you are using a bulky or super-bulky yarn, you can knit a scarf thirteen stitches wide. A thirteen-stitch strip in a lighter-weight yarn could be made into a doll scarf, a necklace or decorative narrow scarf, or wrist warmers.
'I wanted to knit my grandchild a sweater, but I had no wool.'
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You can knit a simple scarf, or a hot pad.
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One way that one can find information on how to knit a scarf is to take a knitting class. A common and basic knitting starting project is to knit a scarf, so most likely, the teacher would start off with something like that.
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to allow expansion in summer
garter stitch is when the rows alternate knit, purl, knit, purl. Since purl is the reverse of knit, for a scarf you just have to set aside a few stitches for your border on either side and knit all of them every row.