>>723791053
No they aren't. They have no grafting
They have thorns. They also share the same thorns as the Fore Giant and the Ulcerated Tree Spirit in the DLC drops the mantle of Thorns because all Ulcerated Tree Spirits are just bodies of the old Order that grow mutated sue to Marika turning the crossed tree into the Scadutree.

The connection between Sacred Tree and people bound by the Order which manifests said Tree is also the crux of the Endings. Stormveil is a representation of Marika's sin of usurping the Order. If the inhabitants of the Lands Between are trees that can be grafted and mended together, sprout into deathroot when corrupted or can grow by accumulating life power, then when the Order they are bound to is undone they end up mutating without Order, growing those roots outwards into twisted and thorny branches, regardles sof them being dead or alive.

This is why the one single Fire Giant without thorn was bound to the Erdtree by Marika and all his comrades sprouted. This is the same process of mutation that causes the Omen through the Omen curse and the Sanguine mutation through Mohg's Blood.