Never heard that in British English - not saying it isn’t used somewhere, but I live in an area where small and large forestry operation is fairly common.

“lop” is a verb - if you cut side branches off a tree, thin it out or similar, then that is what you might be doing (especially if you cut through in one stroke as opposed to sawing). The resulting branches would normally be just described as “wood”.

If a tree is cut down or falls on a path, it might be called a “dead tree”.

“deadwood” can mean any dead wood, including in a still upright tree.

Note that fallen_tree is a commonly used obstacle value.

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