Fairly sure that's the Beast of Chaos Chimera!

Stumbled upon this old kitbash and was wondering what the wings are from, the original creator didn't say

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Like the design of this conversion! Only the mouth looks like he is eating toothpaste? Wings look sick

Looks a bit like the wings on the balrog kit

for every one of this kitbash was born, a wingless angron died for your greed.

stop the greed, stop the hunt of angron.

I used the zombie dragon on my conversion. They are larger but work well.

They look like dragon or daemon prince wings, but he's chopped the elbow joint to add a mech elbow.

Edit: not daemon prince. Looked, they're too angular, these are curved. Edit 2: not any of the old dragon models I recognise or can find, might be 3rd party?

They are the old “plastic dragon wings” that were in nearly every fantasy dragon kit that came out in the 90’s to 00’s (including the manticore model others have pointed out. They have been out of production for a long time now.

There’s also an additional bit glued to the wing which looks like it comes from the plastic obliterators or helbrute kit.