If you read the complete verse of Leviticus 11:21, the legs of a kosher flying insect הָע֔וֹף are 6 [legs] = אַרְבַּ֑ע Arba 4 [legs] + 2 Kra'ayim כְרָעַ֨יִם֙ Jointed [legs] above.

In Hebrew, the phrase " הָע֔וֹף הַהֹלֵ֖ךְ עַל־אַרְבַּ֑ע " means "insect that walks on four [legs]" in English. - Notice the additional 2 Kra'ayim כְרָעַ֨יִם֙ Jointed [legs] above the regular four legs for hopping.

Leviticus / Vayikra 11:21 [MT]

"However, among all the flying insects that walk on four [legs], you may eat [from] those that have jointed [leg like] extensions above its [regular] legs, with which they hop on the ground." ( אַ֤ךְ אֶת־זֶה֙ תֹּֽאכְל֔וּ מִכֹּל֙ שֶׁ֣רֶץ הָע֔וֹף הַֽהֹלֵ֖ךְ עַל־אַרְבַּ֑ע אֲשֶׁר־ל֤וֹ (כתיב אשׁר־לא) כְרָעַ֨יִם֙ מִמַּ֣עַל לְרַגְלָ֔יו לְנַתֵּ֥ר בָּהֵ֖ן עַל־הָאָֽרֶץ )

If you read the complete verse of Leviticus 11:21, the total legs of a kosher flying insect הָע֔וֹף are 6 [legs] = אַרְבַּ֑ע Arba 4 [legs] + 2 Kra'ayim כְרָעַ֨יִם֙ Jointed [legs] above.

In Hebrew, the phrase " הָע֔וֹף הַהֹלֵ֖ךְ עַל־אַרְבַּ֑ע " means "insect that walks on four [legs]" in English. - Notice the additional 2 Kra'ayim כְרָעַ֨יִם֙ Jointed [legs] above the regular four legs for hopping.

Leviticus / Vayikra 11:21 [MT]

"However, among all the flying insects that walk on four [legs], you may eat [from] those that have jointed [leg like] extensions above its [regular] legs, with which they hop on the ground." ( אַ֤ךְ אֶת־זֶה֙ תֹּֽאכְל֔וּ מִכֹּל֙ שֶׁ֣רֶץ הָע֔וֹף הַֽהֹלֵ֖ךְ עַל־אַרְבַּ֑ע אֲשֶׁר־ל֤וֹ (כתיב אשׁר־לא) כְרָעַ֨יִם֙ מִמַּ֣עַל לְרַגְלָ֔יו לְנַתֵּ֥ר בָּהֵ֖ן עַל־הָאָֽרֶץ )

In Hebrew, the phrase " הָע֔וֹף הַהֹלֵ֖ךְ עַל־אַרְבַּ֑ע " means "insect that walks on four [legs]" in English. - If you keep reading verse 21, you may notice the description a kosher insect is still a 6-legged insect which walks on אַרְבַּ֑ע Arba 4 [legs] and hops on the other 2 Kra'ayim כְרָעַ֨יִם֙ Jointed [legs] above the regular four legs.

Leviticus / Vayikra 11:21 [MT] "However, among all the flying insects that walk on four [legs], you may eat [from] those that have jointed [leg like] extensions above its [regular] legs, with which they hop on the ground." ( אַ֤ךְ אֶת־זֶה֙ תֹּֽאכְל֔וּ מִכֹּל֙ שֶׁ֣רֶץ הָע֔וֹף הַֽהֹלֵ֖ךְ עַל־אַרְבַּ֑ע אֲשֶׁר־ל֤וֹ (כתיב אשׁר־לא) כְרָעַ֨יִם֙ מִמַּ֣עַל לְרַגְלָ֔יו לְנַתֵּ֥ר בָּהֵ֖ן עַל־הָאָֽרֶץ )

In total, the legs of a kosher flying insect הָע֔וֹף equal 6 [legs] = אַרְבַּ֑ע Arba 4 [legs] + 2 Kra'ayim כְרָעַ֨יִם֙ Jointed [legs] above.

If you read the complete verse of Leviticus 11:21, the legs of a kosher flying insect הָע֔וֹף are 6 [legs] = אַרְבַּ֑ע Arba 4 [legs] + 2 Kra'ayim כְרָעַ֨יִם֙ Jointed [legs] above.

In Hebrew, the phrase " הָע֔וֹף הַהֹלֵ֖ךְ עַל־אַרְבַּ֑ע " means "insect that walks on four [legs]" in English. - Notice the additional 2 Kra'ayim כְרָעַ֨יִם֙ Jointed [legs] above the regular four legs for hopping.

Leviticus / Vayikra 11:21 [MT]

"However, among all the flying insects that walk on four [legs], you may eat [from] those that have jointed [leg like] extensions above its [regular] legs, with which they hop on the ground." ( אַ֤ךְ אֶת־זֶה֙ תֹּֽאכְל֔וּ מִכֹּל֙ שֶׁ֣רֶץ הָע֔וֹף הַֽהֹלֵ֖ךְ עַל־אַרְבַּ֑ע אֲשֶׁר־ל֤וֹ (כתיב אשׁר־לא) כְרָעַ֨יִם֙ מִמַּ֣עַל לְרַגְלָ֔יו לְנַתֵּ֥ר בָּהֵ֖ן עַל־הָאָֽרֶץ )