Can lions, or its cubs climb trees?

They can, indeed. climb trees. There are lions in the Serengeti famous for their tree climbing activities. read more

Most lions don't really climb trees unless they are really motivated by food or a threat. Actually, there are no more than two populations of lions that climb trees on a regular basis. They are The tree climbing lions of Queen Elizabeth National Park in Uganda It is somewhat uncommon for lions to actually climb trees. read more

Trees in Africa are the province of the leopard, who drags its prey up into trees to protect it from lions. Whether or not lions are able to climb trees depends entirely upon the size of the tree. They sometimes lounge in low (very strong) branches, and can pursue a leopard into a tree, provided (once again) the tree has low, very strong branches. read more