
der Klotz
block
A large, solid, and often roughly worked piece of material, usually made of wood or stone.
Der Bildhauer begann seine Arbeit an einem großen Marmorklotz.
The sculptor began his work on a large block of marble.
block / oaf
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block
A large, solid, and often roughly worked piece of material, usually made of wood or stone.
Der Bildhauer begann seine Arbeit an einem großen Marmorklotz.
The sculptor began his work on a large block of marble.

to be a burden
To be a burden, an obstacle, or a person that seriously hinders or weighs someone down.
Die alten Schulden sind für ihn ein echter Klotz am Bein.
The old debts are a real burden for him.

oaf
Colloquial and derogatory for a clumsy, coarse, or awkward person.
Beweg dich mal, du Klotz!
Move it, you oaf!
The expression 'ein Klotz am Bein sein' (to be a burden/a millstone around someone's neck) is very common. The person burdened by something is in the dative. The expression describes a heavy burden or an obstacle.
Diese teure Wohnung ist mir mittlerweile ein Klotz am Bein.
This expensive apartment has become a burden to me by now.
When 'Klotz' (oaf) describes a person, it is colloquial and derogatory. It labels someone as coarse, clumsy, or slow.
Was stehst du da rum wie ein Klotz?
Why are you standing around there like an oaf?
In its literal meaning, 'Klotz' (block) is often combined with the material it is made of. Typical examples are 'Holzklotz' (block of wood), 'Steinklotz' (block of stone), or 'Marmorklotz' (block of marble).
Er spaltet den Holzklotz mit einem einzigen Axtschlag.
He splits the block of wood with a single axe blow.
block / pad
Block and Klotz both refer to a large, solid piece of firm material. A Block tends to be compact and regularly shaped, whereas a Klotz is usually rough or only minimally worked. Block is more suitable for a clearly shaped piece, while Klotz is more suitable for an irregular one.

Der Tischler spaltet einen groben Klotz Holz vor der Werkstatt.
The carpenter splits a rough wooden block outside the workshop.
Der Tischler sägt die Bretter aus einem regelmäßig geformten Block Holz.
The carpenter saws the boards from a regularly shaped block of wood.