Scrawny

google

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mid 19th century: variant of dialect scranny ; compare with archaic scrannel ‘weak, feeble’ (referring to sound).

wiktionary

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A variant of dialectal scranny(“thin; lean; scraggy; poor; scanty; of inferior quality”), perhaps from Old Norse skran(“rubbish; junk”) +‎ -y. Compare English scrannel(“lean; meager; poor; worthless”).

Alternatively, perhaps from Old Norse skrælna(“to be shrivelled”) [1].

etymonline

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scrawny (adj.)

1824, apparently a dialectal variant of scranny "lean, thin" (1820), which is of uncertain origin but probably from a Scandinavian source, perhaps Old Norse skrælna "to shrivel." Compare scrannel.