"绿色的脚" (green feet) 在英文中没有一个固定的词语来表示这个意思。

如果你想表示脚底有绿色的污渍或是染色，你可以说 "feet with green stains" 或是 "feet with green dye on them"。例如：

"I can't wear these sandals because my feet have green stains on them from the grass." (我不能穿这双凉鞋，因为我的脚上有绿色的草地污渍。)
"I accidentally stepped in some green paint and now my feet are covered in green dye." (我不小心踩到了一些绿色的油漆，现在我的脚上染满了绿色。)

如果你想表示脚底有绿色的长毛或毛发，你可以说 "feet with green hairs" 或是 "feet with green fur"。例如：

"I've been working in the garden all day and now my feet have green hairs stuck to them." (我整天都在花园里干活，现在我的脚上有绿色的毛发粘住了。)
"I woke up this morning and saw that my feet had grown green fur overnight." (我今天早上醒来，发现我的脚在一夜之间长出了绿色的毛发。)

这些表达方式并不是常见的表达方式，而且可能不太自然，因此在正常的英文对话中很少用到。