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From Anglo-Saxon literature we can garner information from the examination of Grendel’s severed arm and his mother’s head. And from the descriptions we can deduce that this was a scaly skinned hard clawed creature.
“…Every nail, claw-scale and spur, every spike and welt on the hand of that heathen brute was like barbed steel. Everybody said there was no honed iron hard enough to pierce him through, no time proofed blade that could cut his brutal blood caked claw…”
“…going as far as stating that Grendel could easily have been a bipedal dragon…”
From this information it seems to me that the St’rm may be the ancestors of this infamous Grendel and his mother. And if this is so, then it appears the St’rm may be dragonkin.